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Unformatted text preview: Physics ZB—Section ﬂ
Electricity and Magnetism
Prof. luan K. Schuller
Spring 208 TE ST 8
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Figure 1
«t— 20 cm—oh x X X T
x x x 20cm
:n: x x 1
a b
10:2 1) In Figure 1, a wire and a 10 ohm resistor are used to form a circuit in the shape of a square, 20 cm by 20 cm.
A uniform but nonsteady magnetic field is directed into the plane of the circuit. The magnitude of the
magnetic field is decreased from 0.90 T to 0.30 T in a time interval of 60 ms. The average induced current
and its direction through the resistor, in this time interval, are closest to: A) 60 mA, from a to b
B) 24 mA, from a to b
C) 40 mA, from b to a
D) 24 mA, from b to a
E) 40 mA, from a to b A long vertical wire carries a steady 10 A current. A pair of rails are horizontal and are 0.20 m apart. A 20 ohm resistor
connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a
constant velocity of 0.40 m/ s, as shown. The bar and the rails have negligible resistance. At a given instant t1, the bar is
0.20 m from the wire, as shown. 2) In Figure 2, at time t1, the induced current and its direction through the resistor are closest to: A) 0.04 MA, from a to b
B) 0.12 “A, from b to a
C) 0.02 MA, from b to a
D) 0.02 MA, from a to b
E) 0.04 uA, from b to a Name Code Number Version A Figure 3 s 3) In Figure 3, a coil of wire is placed on the axis of a solenoid carrying a DC current. Which of the following
will NOT result in an EMF being induced in the coil?
A) Rotate the coil about the x—axis.
B) Rotate the coil about the y—axis.
C) Move the coil toward point P.
D) Change the current in the solenoid.
E) Rotate the coil about the z—axis. 4) In Figure 4, a bar magnet moves away from the solenoid. The induced current through the resistor R is:
A) from b to a B) from a to b C) zero 5) In Figure 5, a bar is in contact with a pair of parallel rails and is in motion with velocity V. A uniform
magnetic field is present. The induced current through the resistor R is:
A) from a to b B) zero C) from b to a Figure 6 .
b 6) In Figure 6, a loop carries a steady current I. A bar is in contact with a pair of circular rails, and rotates
about the center of the loop. The induced current through the resistor R is:
A) from a to b B) zero C) from b to a A—3 Answer Key
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