Question

What does induction in an open circuit show about the cause of induced emf?

Options

• Current must flow before emf can be induced.

• Infinite resistance prevents any emf from being induced.

• Constant magnetic flux induces emf without current.

• Change in magnetic flux induces emf, not current.

Answer 1

An open circuit can have induced emf even though no current flows. This separates the cause of emf—a change in magnetic flux—from the possible flow of current.