Two loops of wire are arranged so that a changing current in one will induce a current in the other. If the current in the first is increasing counterclockwise by 1.0 A every second, the induced current in the second loop will:
a. be increasing counterclockwise.
c. stay zero.
b. increase clockwise also.
d. stay constant.
[Ques. 2] The quantity strain expressed in terms of the fundamental quantities (mass, length, time) is equivalent to:
a. MLT-1.
c. M2L-1T-3.
b. ML-1T-2.
d. a dimensionless quantity.
[Ques. 3] A bar magnet is falling through a loop of wire with constant velocity. The north pole enters first. As the south pole leaves the loop of wire, the induced current (as viewed from above) will be:
a. along the length of the magnet.
c. counterclockwise.
b. zero.
d. clockwise.
[Ques. 4] The quantity stress expressed in terms of the fundamental quantities (mass, length, time) is equivalent to:
a. MLT-1.
c. M2L-1T-3.
b. ML-1T-2.
d. a dimensionless quantity.
[Ques. 5] A bar magnet is falling through a loop of wire with constant velocity. The south pole enters first. The induced current will be greatest in magnitude when the magnet is located so that:
a. with no acceleration, the induced current is zero.
b. the loop is near the south pole only.
c. the loop is near either the north or the south pole.
d. the loop is near the middle of the magnet.
[Ques. 6] In an elastic solid there is a direct proportionality between strain and:
a. elastic modulus.
c. cross-sectional area. b. temperature.
d. stress.
[Ques. 7] A bar magnet is falling through a loop of wire with constant velocity. The south pole enters first. As the magnet leaves the wire, the induced current (as viewed from above):
a. is along the length of the magnet.
c. is counterclockwise.
b. is clockwise.
d. is zero.
[Ques. 8] A copper alloy wire of length 2.0 m, cross sectional area 7.1 10-6 m2, and Young's modulus 11 1010 N/m2, has a 200-kg load hung on it. What is its increase in length? (g = 9.8 m/s2)
a. 0.50 mm
c. 2.5 mm
b. 1.0 mm
d. 5.0 mm
[Ques. 9] The principle or law that says an induced emf in a circuit loop produces a current whose magnetic field opposes further change of magnetic flux is credited to:
a. Ampere.
c. Lenz.
b. Volta. d. Faraday.
[Ques. 10] A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 4.0 cm. If a timer is started when its displacement is a maximum (hence x = 4 cm when t = 0), what is the speed of the mass when t = 5 s?
a. zero
c. 0.016 m/s
b. 0.0065 m/s
d. 0.024 m/s
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