physics review #1 lchsdr.e. in order to produce a magnetic field, an electric charge must be (a)...

Physics Review #1Physics Review #1

LCHSLCHS

Dr.EDr.E

In order to produce a magnetic field, an electric charge must be

(A) stationary(B) moving (C) positive(D) negative

The diagram shows the lines of magnetic force between two north magnetic poles. At which point is the magnetic field strength greatest? (A) A (B) B (C) C (D) D

A beam of electrons is directed into the electric field between two oppositely charged parallel plates. The force exerted on the electrons by the magnetic field is directed

(A) into the screen (B) out of the screen (C) toward the top or bottom of the screen (D) no change in direction

NORTH

SOUTH

Magnetic fields are produced by particles that are

(A) moving and charged(B) moving and neutral(C) stationary and charged(D) stationary and neutral

Magnets exert ____ on each other. 

A. ChargesB. ConnectivityC. ForcesD. Radiation

If you break a magnet in half twice, you will have...

A. 2 complete magnets with a North and South Pole

B. 2 magnets with 1 north pole and 1 south pole

C. 4 magnets with 2 north poles and 2 south poles

D. 4 complete magnets each with a North and South Pole

A magnetic field is...

A. The space around the magnet in which a magnetic force is exerted.

B. A producer of magnetic forces.C. A picture of many magnets in a field.D. The iron that you place on top of a

magnet.E. A bad Kevin Costner movie.

Clusters of aligned atoms are called...A. MagnetismB. Magnetic DomainsC. Magnetic FieldsD. Magnetic Poles

A strong electromagnet is...

A. A current-carrying coil of wire with many loops

B. A current-carrying coil of wireC. A wire with many loopsD. A coil of wire

If a single looped, current-carrying wire is bent into another loop, the concentration of the magnetic field lines inside the double loop is...

A. Half as much as in the single loopB. Four times as much as in the single loopC. The same as in the single loopD. Twice as much as in the single loop

The force is greatest on a charged particle when the particle moves in a direction...A. perpendicular to the magnetic field lines.B. parallel to the magnetic field lines. C. at a 45 degree angle. D. in a circle. 

If the direction of current in the wire is reversed, the deflecting force acts in the...

A. Same directionB. Opposite directionC. Downward directionD. Upward direction

What does placing a piece of iron into a current-carrying coil create?

A. A smaller magnetic field. B. A breaking of the coil.C. An electromagnet.D. A magnetic field. 

What is a device used for changing the potential difference (voltage) of alternating currents?

A. An ammeter.B. A voltmeter. C. A direct current. D. A transformer. E. Not possible

What is a device used for changing the current (amperage) of alternating currents?

A. An ammeter.B. A voltmeter. C. A direct current. D. A transformer. E. Not possible

What is a device used for changing the power (watts) of alternating currents?

A. An ammeter.B. A voltmeter. C. A direct current. D. A transformer. E. Not possible

A typical solenoid that has current flowing through it behaves like…a. wireb. a bar magnetc. electricityd. transformer

In a turbine, the blades spin the magnet rapidly, rotating the magnet inside the coil of the generator producing a(n)A. voltageB. resistanceC. electric current

Which metal does NOT have a natural magnetism?

A. CobaltB. NickelC. Copper D. Iron

What is a machine that produces electrical current by rotating a coil within a stationary magnetic field?

A. Generator B. TransformerC. Light bulb

What is the AVERAGE period time between when Earth’s poles have switched in the past?

A. 10,000 yearsB. 100,000 yearsC. 200,000 years D. 750,000 years

Charged particles from outer space are deflected by Earth’s _____.A. magnetic fieldB. atmosphereC. ozoneD. lithosphereE. greenhouse gas

Magnetism is related to ________.

A. biologyB. chemistryC. electricityD. geologyE. PsychologyF. None of these

Sunspots on the sun’s surface are places where:A. The sun has been burntB. Gravity is greaterC. Magnetism is lessD. Magnetism is greater

How is a magnetic field produced?A. By polar attractionB. By the motion of electric charge.C. By the nature of a magnetic field

Mars no longer has a magnetic field becausea. The core has solidified b. The magnetic field has reversed c. Because Mars is spinning faster d. It is a permanent magnet

According to Faraday’s law the induce voltage in a coil is ______ to the product of number of loopsA. Not relatedB. Inversely proportionalC. Proportional

A changing magnetic field induces a/an _____A. Magnetic fieldB. Electric fieldC. Force fieldD. Circuit breakers

For a transformer:The primary voltage is 120 volts and the primary amperage is 5 amps, the

power is _____ watts.

For a transformer:If the primary voltage is 120 volts

and the primary amperage is 5 amps, the power is _____ watts in the

secondary.

For a transformer:If the primary voltage is 120 volts

and the primary amperage is 5 amps with 1:20 ratio, what is the voltage in

the secondary?

For a transformer:If the primary voltage is 120 volts

and the primary amperage is 5 amps with 1:20 ratio, what is the amperage

in the secondary?

For a transformer:The secondary voltage is 120 volts and the secondary amperage is 5 amps, the power is _____ watts.

For a transformer:If the secondary voltage is 120 volts

and the secondary amperage is 5 amps, the power is _____ watts in the

primary.

For a transformer:If the secondary voltage is 120 volts

and the secondary amperage is 5 amps with 1:20 ratio, what is the

voltage in the primary?

For a transformer:If the secondary voltage is 120 volts

and the secondary amperage is 5 amps with 1:20 ratio, what is the

amperage in the primary?

For a transformer:For a transformer:

The primary has a voltage of 6000 volts and The primary has a voltage of 6000 volts and amperage is 200 amps.amperage is 200 amps.

What is the power in the primary?What is the power in the primary?

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For a transformer:For a transformer:

The primary has a voltage of 6000 volts and The primary has a voltage of 6000 volts and amperage is 200 amps.amperage is 200 amps.

The secondary has a voltage of 480,000 volts and The secondary has a voltage of 480,000 volts and amperage is 2.4 amps.amperage is 2.4 amps.

What is the power in the secondary?What is the power in the secondary?

3939

For a transformer:For a transformer:

The primary has a voltage of 6000 volts and The primary has a voltage of 6000 volts and amperage is 200 amps.amperage is 200 amps.

The secondary has a voltage of 480,000 volts and The secondary has a voltage of 480,000 volts and amperage is 2.4 amps.amperage is 2.4 amps.

What is the efficiency of the transformer?What is the efficiency of the transformer?

4040