Question

When a loop moves towards a stationary magnet with speed $v$, the induced emf in the loop is $E$. If the magnet also moves away from the loop with the same speed, then the emf induced in the loop is

• A. $E$
• B. $2E$
• C. $\frac{E}{2}$
• D. zero

Answer 1

The correct option is D zero

Faraday's Law states that an electric field is induced by changing magnetic flux.
If both of them move with the same velocity in the same direction, the relative velocity is zero, hence there is no change of magnetic flux across the loop with time.
Hence no EMF is induced.