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Unformatted text preview: Physics ZB—Section B
Electricity and Magnetism
Prof. luan K. Schuller
lIJinter 2006 TEST 9
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the questi0n. An 18 mH solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. A coil is tightly wound around
the solenoid at its center. The coil resistance is 5.0 ohms. The mutual inductance of the coil and solenoid is 60 “H. At a
given instant, the current in the solenoid is 300 mA, and is decreasing at the rate of 2.5 A/ s. 1) In this situation, the number of turns in the winding of the solenoid is Closest to:
A) 1320 B) 1240 C) 1280 D) 1200 E) 1160 Figure 1 __——€ 60V 30H 12;) An R—L circuit has a 60 V battery, a 30 H inductor, a 12 ohm resistor, and a switch 5, in series, as shown. Initially, the
switch is open, and there is no magnetic ﬂux in the inductor. At time t = 0 s, the switch is closed.
2) In Figure 1, when the resistor voltage is equal to the inductor voltage, the current in the circuit is closest to:
A) 1.0 A B) 2.5 A C) 2.0 A D) 1.5 A E) 3.0 A Figure 2 x33;
P 3) In Figure 2, one end of a bar is in contact with a circular rail and the other end is pivoted at P. A steady,
uniform, magnetic field B is present. The bar rotates about P. The induced current through the resistor R 153
A) from b to a B) zero C) from a to b 4) An RL circuit consists of a switch, an emf source, a 4.0—kQ resistor, and a 5.01—1 inductor. If the emf for the circuit is 42.0 V 3.0 ms after the switch is closed, find ED.
A) 32 V B) 56 V C) 46 V D) 420 V 5) A current of Ht) 2 7t“ 2 + 23, where t is time, flows through an inductor. If the self—inductance is 40 H,
what is the emf across the inductor? A) 140t1/2  920 V B) —186%t3/2 — 92m v
C) —140t'1/2 v 13) 486%13/2 V
Name Code Number Version A 6) A 3.0—A current passes through an inductor. If the inductor stores 12] of energy, what is the inductance?
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 Spring '08
 schuller
 Inductance, Magnetic Field, Inductor, mH solenoid inductor

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