Large loop. Small ring
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1 Q30.1 A small, circular ring of wire (shown in blue) is inside a larger loop of wire that carries a current I as shown. The small ring and the larger loop both lie in the same plane. If I increases, the current that flows in the small ring Large loop Small ring I I A. is clockwise and caused by self-inductance. B. is counterclockwise and caused by self-inductance. C. is clockwise and caused by mutual inductance. D. is counterclockwise and caused by mutual inductance.
2 A30.1 A small, circular ring of wire (shown in blue) is inside a larger loop of wire that carries a current I as shown. The small ring and the larger loop both lie in the same plane. If I increases, the current that flows in the small ring Large loop Small ring I I A. is clockwise and caused by self-inductance. B. is counterclockwise and caused by self-inductance. C. is clockwise and caused by mutual inductance. D. is counterclockwise and caused by mutual inductance.
3 Q30.2 A current i flows through an inductor L in the direction from point b toward point a. There is zero resistance in the wires of the inductor. If the current is decreasing, A. the potential is greater at point a than at point b. B. the potential is less at point a than at point b. C. the answer depends on the magnitude of di/dt compared to the magnitude of i. D. The answer depends on the value of the inductance L. E. both C. and D. are correct.
4 A30.2 A current i flows through an inductor L in the direction from point b toward point a. There is zero resistance in the wires of the inductor. If the current is decreasing, A. the potential is greater at point a than at point b. B. the potential is less at point a than at point b. C. the answer depends on the magnitude of di/dt compared to the magnitude of i. D. The answer depends on the value of the inductance L. E. both C. and D. are correct.
5 Q30.3 A steady current flows through an inductor. If the current is doubled while the inductance remains constant, the amount of energy stored in the inductor A. increases by a factor of 2. B. increases by a factor of 2. C. increases by a factor of 4. D. increases by a factor that depends on the geometry of the inductor. E. none of the above
6 A30.3 A steady current flows through an inductor. If the current is doubled while the inductance remains constant, the amount of energy stored in the inductor A. increases by a factor of 2. B. increases by a factor of 2. C. increases by a factor of 4. D. increases by a factor that depends on the geometry of the inductor. E. none of the above
7 Q30.4 An inductance L and a resistance R are connected to a source of emf as shown. When switch S 1 is closed, a current begins to flow. The final value of the current is A. directly proportional to RL. B. directly proportional to R/L. C. directly proportional to L/R D. directly proportional to 1/(RL). E. independent of L.
8 A30.4 An inductance L and a resistance R are connected to a source of emf as shown. When switch S 1 is closed, a current begins to flow. The final value of the current is A. directly proportional to RL. B. directly proportional to R/L. C. directly proportional to L/R. D. directly proportional to 1/(RL). E. independent of L.
9 Q30.5 An inductance L and a resistance R are connected to a source of emf as shown. When switch S 1 is closed, a current begins to flow. The time required for the current to reach one-half its final value is A. directly proportional to RL. B. directly proportional to R/L. C. directly proportional to L/R. D. directly proportional to 1/(RL). E. independent of L.
10 A30.5 An inductance L and a resistance R are connected to a source of emf as shown. When switch S 1 is closed, a current begins to flow. The time required for the current to reach one-half its final value is A. directly proportional to RL. B. directly proportional to R/L. C. directly proportional to L/R. D. directly proportional to 1/(RL). E. independent of L.
11 Q30.6 An inductance L and a resistance R are connected to a source of emf as shown. Initially switch S 1 is closed, switch S 2 is open, and current flows through L and R. Later, S 1 is open and S 2 is closed, this current A. remains constant. B. increases with time. C. decreases with time. D. not enough information given to decide
12 A30.6 An inductance L and a resistance R are connected to a source of emf as shown. Initially switch S 1 is closed, switch S 2 is open, and current flows through L and R. Later, S 1 is open and S 2 is closed, this current A. remains constant. B. increases with time. C. decreases with time. D. not enough information given to decide
13 Q30.7 An inductor (inductance L) and a capacitor (capacitance C) are connected as shown. If the values of both L and C are doubled, what happens to the time required for the capacitor charge to oscillate through a complete cycle? A. It becomes 4 times longer. B. It becomes twice as long. C. It is unchanged. D. It becomes 1/2 as long. E. It becomes 1/4 as long.
14 A30.7 An inductor (inductance L) and a capacitor (capacitance C) are connected as shown. If the values of both L and C are doubled, what happens to the time required for the capacitor charge to oscillate through a complete cycle? A. It becomes 4 times longer. B. It becomes twice as long. C. It is unchanged. D. It becomes 1/2 as long. E. It becomes 1/4 as long.
15 Q30.8 An inductor (inductance L) and a capacitor (capacitance C) are connected as shown. The value of the capacitor charge q oscillates between positive and negative values. At any instant, the potential difference between the capacitor plates is A. proportional to q. B. proportional to dq/dt. C. proportional to i(t). D. both A and C. E. all of A, B, and C.
16 A30.8 An inductor (inductance L) and a capacitor (capacitance C) are connected as shown. The value of the capacitor charge q oscillates between positive and negative values. At any instant, the potential difference between the capacitor plates is A. proportional to q. B. proportional to dq/dt. C. proportional to i(t). D. both A and C. E. all of A, B, and C.
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