Two separate but similar coils of wire are mounted close to each other, as shown

Question

Two separate but similar coils of wire are mounted close to each other, as shown below.

The primary coil is connected to a battery and the secondary coil is connected to a current meter. Consider the following situations: (1) The switch is open and there is no current in the primary. (2) As the switch is being closed, the current in the primary is rapidly rising toward its maximum value. (3) The switch is closed and there is a steady current in the primary. (4) As the switch is being openned, the current in the primary is rapidly falling to zero. In which of those situations will the current meter indicate a current flowing in the secondary coil? Select all that apply.

•current in the primary is decreasing
•current in the primary is zero
•current in the primary is constant
•current in the primary is increasing

Explanation / Answer

apply Lenz's law if only when we see a change in primary coil there will be change secondary coil ( or current, opposing current )

at steady no change so

answer are

current in the primary is decreasing

•current in the primary is increasing

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