a)The magnitude of the EMF induced in the copper ring is: 1. smaller at time t = 0 than at time t = 10 seconds. 2. largerattimet=0thanattimet=10seconds. 3. thesameattimest=0andt=10seconds. b)At time t = 3 seconds, the current induced in the copper ring is: 1. in the clockwise direction. 2. in the counter-clockwise direction. 3. zero.

a)The magnitude of the EMF induced in the copper ring is: 1. smaller at time t = 0 than at time t = 10 seconds. 2. largerattimet=0thanattimet=10seconds. 3. thesameattimest=0andt=10seconds. b)At time t = 3 seconds, the current induced in the copper ring is: 1. in the clockwise direction. 2. in the counter-clockwise direction. 3. zero.

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Question

A very long straight wire runs along the z-axis and carries a time-dependent current I(t) in the upward (+z) direction, thereby creating a time-varying magnetic field. The graph on the right side of the figure below shows the time dependence of this current: it begins at zero at time t = 0, and is gradually increased in the manner shown. A circular copper ring is placed next to the straight wire and is oriented so that it lies in the x-z plane.

a)The magnitude of the EMF induced in the copper ring is:

1. smaller at time t = 0 than at time t = 10 seconds.

2. largerattimet=0thanattimet=10seconds.

3. thesameattimest=0andt=10seconds.

b)At time t = 3 seconds, the current induced in the copper ring is:

1. in the clockwise direction.

2. in the counter-clockwise direction.

3. zero.

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