Question

Which of these changes would generate more electric current?

A.
using a different electric meter

B.
using a smaller bar magnet

C.
using a larger diameter cardboard tube

D.
using a longer wire wrapped around the coil

Answer 1

D. using a longer wire wrapped around the coil

Reason: more wire means more turns (greater flux linkage), which increases the induced emf according to Faraday’s law, so more current will be produced. (Changing the meter doesn’t make more current, a smaller magnet or a larger-diameter tube would reduce the magnetic flux through the coil.)