PHY 2049: Physics II

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HITT (read carefully) Two 110-V light bulbs, one “25W" and the

other “100W", are connected in series to a 110V source. Then:

A. the current in the 100-W bulb is greater than that in the 25-W bulb

B. the current in the 100-W bulb is less than that in the 25-W bulb

C. both bulbs will light with equal brightness D. each bulb will have a potential difference of

55V E. none of the above

Magnet has two poles. N points to North

B Direction from N-S.

Brought to Medit. by Marco Polo. Maritime traffic across jumped.

What direction are the forces in the picture above?

BvqF

ilB = mg B = mg/il

Crossed Fields F = q[E+vxB] For v = vo = E/B,

goes straight. For v > vo , goes

up

v

E

B

Hall Effect

Vy = Ey d, eEy = evx Bz

Ex = ρ Jx

Ey = Rh Jx

Rh = B/ne

x

y

Hall Effect

Vy = Ey d, eEy = evx Bz

Ex = ρ Jx

Ey = Rh Jx

Rh = B/ne

x

y

Hall Effect

Vy = Ey d, eEy = evx Bz

Ex = ρ Jx

Ey = Rh Jx

Rh = B/ne

x

y

Quantum Hall Effect

Rh

B

F = ilB

= i x B l

Τ = M x B,

M = NiA

U = M.B

Galvanometer

Mg sinθ r = μB sinθ

μ = 2rLNi