electromagnet field

8/10/2019 Electromagnet Field

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7.1 Electric fields and charge flow

1. The figure shows the electric field between two charged parallel metal plates.

Gambar rajah menunjukkan medan elektrik di antara dua plat logam bercas yang selari.

The electric field will be stronger if

Medan elektrik akan lebih kuat jika

A the distance between the charged metal plates is reduced.

A jarak antara plat logami bercas dikurangkan

B the metal plates used have a larger area.

B platlogami yang digunakan mempunyai luas yang besar

C the charge on each of the metal plates is reduced.

C cas-cas di setiap plat logam dikurangkan

2. A positively charged conducting metal sphere hangs from a nylon thread above a metal plate. The

electric field is as shown in

Sebiji bola logam bercas positif digantung di atas sebuah plat logam. Medan elektrik adalah

seperti yang ditunjukkan oleh

. The figure below shows a charged conducting ping pong ball oscillating in the electric field

between two charged parallel metal plates.

Gambar rajah di bawah menunjukkan sebiji bola ping pong bercas disesarkan di dalam medan

elektrik antara dua plat logam bercas yang selari.

The fre!uency of oscillation of the ball will increase if

rekuensi hayunan bola ping pong akan meningkat jika

A the distance d between the plates is increased.

A jarak! d antara dua plat ditambah


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7. (uring a lightning +3C of charge flow for 12 milliseconds. &hat is the current produced'

Semasa kilat! ()C cas mengalir dalam masa *+ milisaat. Berapakah arus elektrik yang

dihasilkan"

A 2 A

B ) AC 2 4 13A

( ) 4 13AE 2 4 130A

5. The charged sphere of a 6an de #raff generator is discharged by connecting it to the ground using

a wire. A current of 3.) m A flows for 3.2 s. ow much charge was on the sphere before it

discharges'

,ubah sfera penjana an de Graff dinyahcas dengan menyambungkannya ke bumi menggunakan

wayar. Arus elektrik ). mA mengalir dalam masa ).+ s. Berapakah cas di kubah sfera sebelum

dinyahcas"

A 13 8C

B 133 8C

C 2.) mC

( 13 mCE 2.) C


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7.2 9elationship between electric current and potential difference

:. &hich of the following statements is true for an ohmic conductor'

,enyataan manakah yang tepat bagi konduktor ohm"

A &hen the voltage across the conductor increases the current in it decreases.A Semasa /oltan merentasi konduktor bertambah! arus elekrtik berkurang.

B &hen the current in the conductor changes its resistance remains constant.B Semasa arus elektrik di dalam konduktor berubah! rintangan kekal seragam

C The current in it remains constant when the voltage across it increases.

C Arus elektrik kekal seragam apabila /oltan bertambah.

13. A rheostat is connected in the circuit shown.

0eostat disambung seperti litar di bawah.

The reading of the ammeter is ; and the voltmeter is 6. ow do the values of ; and 6 change

when the sliding contact < of the rheostat is slowly moved from = to >'

Bacaan ammeter dan /oltmeter masing-masing ialah 1 dan . bagaimanakah nilai 1 dan

berubah apabila sesentuh S rheostat dilaraskan dari 2 ke 3"A ; increases and 6 increases

A 1 meningkat dan meningkat

B ; increases and 6 decreases

B 1 meningkat dan berkurang

C ; decreases and 6 increases

C 1 berkurang dan meningkat

( ; decreases and 6 decreases

4 1 berkurang dan berkurang

11. &hich circuit is used to determine the resistance 9 of a resistor'

5itar manakah yang digunakan untuk menentukan rintangan 0 sebuah perintang"


5/19

12. &hich of the graph of current ; against voltage 6 for a filament lamp'

Graf manakah mewakili arus elektrik! 1 lawan /oltan! bagi filament lampu"

1. The graph of the potential different 6 against the current ; for a conductor is as shown below.

Graf be6a keupayaan ! lawan arus elektrik! 1 bagi satu konduktor adalah seperti di bawah.

&hich of the following is the correct statement'

,enyataan manakah yang betul"

A The conductor obeys ?hm@s law.

A ,onduktor mematuhi #ukum 7hm.

B The resistance of the conductor increases when the current increases.

B 0intangan konduktor meningkat apabila arus elektrik meningkat.C The resistance of the conductor decreases when the potential difference increases.

C 0intangan konduktor berkurang apabila be6a keupayaan meningkat.

1". The figure shows three pieces of tungsten wire = > and . = and > have same cross0sectional

area A but length of > is twice that of =. > and have the same length 2 but cross sectional

area of is twice that of >.

Gambar rajah menunjukkan tiga utas dawai tungsten 2! 3 adan 8. 2 dan 3 mempunyai luas

keratin rentas A! tetapi panjang 3 adalah dua kali ganda 2. 3 dan 8 mempunyai panjang yang

sama iaitu +5! tetapi luas keratan rentas 8 adalah dua kali 3.

The resistance of the wires are 94 9yand 9respectively then

0intangan wayar bagi 09! 0ydan 06 masing-masing ialah

A 94D 9yD 9B 94 9y 9C 94/ 9yD 9( 94/ 9y 9


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7. '

4alam litar di bawah! jika bacaan /oltmeter 2 ialah (.) . berapakah bacaan oltmeter 3"

A .3 6

B ".3 6

C +.3 6

( :.3 6

E 12 6

1+. Two identical resistors of resistance "F are connected to a battery of negligible resistance shown.

4ua perintang yang sama rintangan iaitu :; disambung kepada bateri yang diabaikan

rintangan dalamnya.

The current from the battery is + A. what is the e.m.f of the battery'

Arus elektrik daripada bateri ialah ( A. Berapakah daya gerak elektrik bateri"

A 1.) 6

B .3 6

C + 6

( 12 6

E 2" 6


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17. Two resistors of resistance 2F and "F are connected in parallel as shown in the circuit. The

current in the resistors are as shown.

4ua perintang yang mempunyai rintangan + ; dan : ; disambung secara selari di dalam litar.

Arus elektrik dalam perintang adalah seperti ditunjukkan.

&hat is the current ; in the "F resistor'Berapakah arus elektrik 1 yang mengalir dalam perintang : ;"

A 1 A

B 2 AC " A

( ) A

E 5 A

15. &hen the switch < is open the reading of the ammeter in the circuit shown below is "A.

Apabila suis S dibuka! bacaan ammeter di dalam ialah :A.

&hat is the ammeter reading after the switch < is closed'

Berapakah bacaan ammeter selepas suis S ditutup"

A 2 A

B A

C " A

( + A

E 12 A


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1:. ;n the circuit shown below the e.m.f of the battery is + 6 and its internal resistance is negligible.

4alam gambar rajah di bawah! daya gerak elektrik bateri ialah ( dan rintangan dalam

diabaikan.

&hat is the ammeter reading'

Berapakah bacaan ammeter"

A 3.+3 A

B 3.72 A

C 1.3 A

( .3 A

23. The circuit shows two resistors connected in parallel.

5itar menunjukkan dua perintang disambung secara selari.

The possible values of the current ;1 ;2and ;are

'ilai yang mungkin bagi arus elektrik 1*! 1+dan 1< ialah

AB

C

(

;1 ;2 ;1) A 13 A ) A

1) A ) A 13 A

13 A ) A ) A

23 A 13 A 13 A


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AE9 2.

''amakan alat radas 2 dan 3"

,i- = G

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.

.

,ii- > G

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.

.

I2 mar%sJ+ markahK

(b) ow is the resistance of the wire calculated from the readings of the apparatus = and >'Bagaimanakah rintangan dawai dihitung daripada bacaan alat radas 2 dan 3"

I2 mar%sJ+ markahK

,c- ;dentify the component labeled and what is its use in the circuit'

,enal pasti komponen berlabel &! dan namakan kegunaannya dalam litar"

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

I2 mar%sJ+ markahK

(d) (ifferent length lof the wire is connected between the points A and B and the correspondingresistance0of the wire is calculated.

&anjang dawai l yang berbe6a disambung antara A dan B! dan seterusnya rintangan dawai 0

dihitung. 0

3 l


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?n the a4es above s%etch the graph to show how the the resistance0of the wire depends on

its length.

4i atas paksi berikut! lakarkan graf bagi menunjukkan rintangan dawai 0 bergantung

kepada panjangnya.

I1 mar%J* markahK

2. The circuit in *igure 2 shows two resistors of the same resistance0connected to a battery ofnegligible internal resistance. ;nitially the switch < is open while the ammeter and voltmeter

readings are 3.23 A and 1.+ 6 respectively.

5itar dalam 0ajah + menunjukkan dua perintang yang sama nilai rintangan 0 disambung pada

bateri yang diabaikan rintangan dalamnya. Semasa suis S dibuka! bacaan ammeter dan

/oltmeter masing-masing ialah ).+) A dan *.( .

*igure 2

0ajah +

,a- Calculate the resistance 9 of one of the resistors.

#itung rintangan 0 bagi salah satu perintang.

I2 mar%sJ+ markahK,b- The sliding contact of the variable resistor is moved to the end =. e4plain what happens to

&enyentuh & bagi perintang boleh laras digerakkan ke hujung 2. =erangkan apa yang

berlaku kepada

,i- The reading of the ammeter

Bacaan ammeter

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH


,ii- The reading of the voltmeter

Bacaan /oltmeter



I" mar%sJ: markahK

,c- The switch < is then closed.

Sui6 S ditutup.

,i- ;f the resistance of the two resistors are e!ual to the value you calculated in ,a- what is

the effective resistance when < is closed'

>ika rintangan bagi dua perintang adalah sama dengan nilai yang dihitung di $a%!

berapakah rintangan berkesan apabila suis S ditutup"


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I2 mar%sJ+ markahK

,ii- ow would the readings of the ammeter and the voltmeter change compared to before the

switch < is closed'Bagaimanakah bacaan ammeter dan /oltmeter berubah jika dibandingkan sebelum suis

S ditutup"HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH


I2 mar%sJ+ markahK

A# *.*

The position of the sliding contact is ad$usted until the length of the wire in the circuit5/ 23.3

cm. The rheostat is ad$usted to obtain a suitable current. The current1 and the potentialdifference across the wire are measured by an ammeter and voltmeter respectively. (iagram

1.2 shows the readings of the ammeter and voltmeter.

The procedure is repeated for lengths of the wire5/ 3.3 cm "3.3 cm )3.3 cm and +3.3 cm.The corresponding readings of the ammeter and voltmeter are shown in (iagrams 1. 1." 1.)

and 1.+.

,edudukan bagi sesentuh gelongsor dilaraskan sehingga panjang dawai dalam litar ialah 5/

23.3 cm. 0eostat dilaraskan untuk memperoleh satu nilai arus yang sesuai. Arus! 1dan be6a

keupayaan! merentasi dawai itu masing-masing diukur oleh ammeter dan /oltmeter. 0ajah *.+

menunjukkan bacaan ammeter dan /oltmeter.

&rosedur itu diulang bagi panjang dawai! 5/ 3.3 cm "3.3 cm )3.3 cm dan +3.3 cm.Bacaan-

bacaan sepadan bagi ammeter dan /oltmeter ditunjukkan dalam 0ajah *.

A

V


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5 ? 23.3 cm

(;A#9AL 1.2 J0A>A# *.+

5/ 3.3 cm(;A#9AL 1. J0A>A# *.A# *.:

5/ )3.3 cm

(iagram 1.) J0ajah *.

5/ +3.3 cm(iagram 1.+ J0ajah *.(

,a- *or the e4periment described on page identifyG

Bagi eksperimen yang diterangkan di halaman

,i- the manipulated variable

pembolehubah dimanipulasikan!

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.

V

V

A

A


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I1 markK

,ii- the responding variable

pembolehubah bergerak balas!

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.I1 markK

,iii- a fi4ed variable.satu pembolehubah dimalarkan.

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.

I1 markK

,b- &hat is the use of the strip of mirror ne4t to the scale of the voltmeter'

Apakah kegunaan jalur cermin di sebelah skala /oltmeter itu"

HH.HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.

I1 markK

,c- Based on (iagrams 1.2 1. 1." 1.) and 1.+ on pages " and ) determine the current1

and potential difference for the corresponding lengths of wire5.*or each value of5 calculate the resistance0of the wire.

The resistance0 is calculated using the formula1

-0 =

Tabulate your results for51 and0in the space below.

Berdasarkan 0ajah *.+! *.

keupayaan! ! yang sepadan dengan panjang dawai! 5.

0intangan! 0! dihitung dengan menggunakan rumus!1

-0 =

>adualkan keputusan anda bagi 51 dan0 pada ruang di bawah.

I) marksK

,d- ?n the graph paper on age 7 plot a graph of0against5.

&ada kertas graf di halaman ! lukiskan graf 0melawan5.

I) marksK

,e- Based on your graph state the relationship between0 and5.Berdasarkan graf anda! nyatakan hubungan antara 0 dan 5.


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HH.HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.

I1 markK

,f-


16/19

Answers.Paper 11. A2. C3. C4. B5. C

6. C7. D8. B9. B10. A11. A12. V13. B14. C15. D16. D17. A

18. D19. D20. B

PAPER 2

1. (a) ! "#$%&e%er

' ! a&&e%er

(b) Ress%ane * readn+ #,

Readn+ #, '

() P ! R-e#s%a%

() C-an+e %-e ress%ane (#r /rren%) n %-e r/%.

Ad/s% #n%r#$ %-e a/n% #, e$e%r /rren%


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(d)

2. (a) R *1

-*

2.3

+.1* 8.0 F

,b- ,i- ;ncreases G resistance decreases current increases

,ii- increases G voltage across resistor increases

9esistance 9 of resistor does not change.

,c- ,i-1

1

0/

3.5

1M

3.5

1

Ee%"e ress%ane R1* 4.0 F

() Ammeter reading increases and voltmeter readings

PAPER 3

(i) State the correct manipulated variable

en+%- L ------------------------------------------------------------------[1 mark]

(ii) State the correct responding variable

Ress%ane R P#%en%a$ derene V C/rren% I ------------------------------[1 mark]

(iii) State one fxed variable correctly

Da&e%er #, %-e wre Cr#ssse%#na$ area #, %-e wre pe #, wre 1 &ar

(b)State the correct use o the mirror

A"#d para$$a: err#r 1 &ar

(c)!abulate L, I, V and Rcorrectly

A Columns L, I, V and R

" Correct units for I, V and R

# All values of I correct

L & I A V V R ;

20.0 0.36 0.4 1.11

30.0 0.42 0.7 1.67

40.0 0.50 1.1 2.20

50.0 0.62 1.7 2.74

60.0 0.70 2.3 3.29


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$ All values of I consistent to 2 d.p.

E All values of V correct

% All values of V consistent to 1 or 2 d.p.

& All values of R correct

' All values of R consistent to 2, or ! d.p.


19/19

56 4

34 3

2 2

1 1

!otal mars! 5

%or a straight line *ith positive gradient passing through the origin/

Ress%ane s dre%$ pr#p#r%#na$ %# $en+%- R dre%$ pr#p#r%#na$ %# L 50

1 &ar

%or a straight line *ith positive gradient that does not pass through theorigin/

Ress%ane nreases $near$ w%- $en+%-

State one suitable precaution

C-e %-e "#$%&e%er ,#r @er# err#r and &ae @er# ad/s%&en% P#s%#n #, %-e ees/- %-a% %-e &a+e #, %-e p#n%er n %-e &rr#r s b$#ed b %-e p#n%er %# a"#dpara$$a: err#r1 &ar

electromagnet field

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