For the current in a stationary circuit to induce a current in an independent stationary circuit,it is necessary for the first circuit to have
A)a steady current.
B)a large current.
C)no current.
D)a changing current.
E)None of these is correct.

Question

Quizplus · Accepted Answer

For current to be induced in an independent stationary circuit, there must be a changing current in the first circuit. This changing current creates a magnetic field, which in turn induces a current in the second circuit through electromagnetic induction. Steady or no current in the first circuit will not generate a changing magnetic field, and therefore will not induce a current in the second circuit. A large current is not necessary, but rather the changing current is what matters.

For the Current in a Stationary Circuit to Induce a Current