Unformatted text preview: d
mT is directed into the page, away
from you. At a given instant, the bar’s speed is 4.60 m/s and
its acceleration is 3.40 m/s2. What current is induced in the
circuit at this time?
(A) 0.836 mA (B) 0.978 mA The motional emf across the bar is (C) 1.28 mA (D) 1.81 mA (E) 2.88 mA so 10 (c) [3pt] In the circuit shown, the
resistors are
5 and
10
, and the inductance is
After having been closed a long time,
the switch is suddenly opened.
What is the current in
immediately after the switch is
opened?
(A) 0 A
(B) 0.9 A
(C) 1.8 A
(D) 2.7 A
When the switch has been closed a long time, the current through t he inductor is
When the switch is opened, the inductor keeps this current going
initially, and it all flows through (d) [3pt] A very large conducting sheet of
dimensions shown is located in the
plane,
with a current flowing in the
direction
and distributed uniformly throughout the
conductor. Use Ampere’s Law to find the
magnetic field a short distance above the
plane, far from any edge. Apply Ampere’s Law to a square “loop” that pierces the entire slab as shown. The magnetic
field will be to the left above the slab and to the right below. (Think of a lot of parallel linear
currents.) If the width of the box is , then Ampere’s Law gives
with
....
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 Spring '12
 ScottYost
 Physics, Magnetic Field, Electric charge

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