9) Initially, an inductor carries a constant current. Then the current is brough
ID: 1302809 • Letter: 9
Question
9) Initially, an inductor carries a constant current. Then the current is brought to a new constant value
twice as large. After this change, what has happened to the potential difference across the inductor?
A) It is larger than before the change by a factor of 4
B) It has the same nonzero value.
C) It continues to be zero
D) It has decreased.
10) A circular loop of wire is held in a uniform magnetic field, with the plane of the loop perpendicular to
the field lines. Which of the following will not cause a current to be induced in the loop?
A) keeping the orientation of the loop fixed and moving it along the field lines
B) rotating the loop about an axis perpendicular to the field lines
C) pulling the loop out of the field
D) crushing the loop mA
11) At an instant of time during the oscillations of an LC circuit, the current is momentarily zero. At this
instant, the voltage across the capacitor is described by which of the following?
A) different from that across the inductor
B) has its maximum value
C) is impossible to determine
D) zero
12) An AC source drives an RLC circuit with a fixed voltage amplitude. If the driving frequency is ?1, the
circuit is more capacitive than inductive and the phase angle is -10
Explanation / Answer
9)C) It continues to be zero
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10) A) keeping the orientation of the loop fixed and moving it along the field lines
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11) D) zero
If the current is at its maximum value, the charge on the capacitor is zero
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12) A) The same amount of power is delivered at both frequencies
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13) C) equal to R
At resonance, XL = XC. , Z = R.
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14) B) 0
The L and C impedances cancel each other out, so you have only R at resonance.
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