Question

Which change will cause an increase in the electric current produced through electromagnetic induction?

using more wire loops in the solenoid
using the opposite pole of the magnet
using a weaker magnet
moving the solenoid slower

Answer 1

Using more wire loops in the solenoid.

Reason: Faraday's law gives emf = −N dΦ/dt, so increasing the number of turns N increases the induced emf (and thus the induced current). Using the opposite pole only reverses the current direction, while a weaker magnet or moving slower reduce dΦ/dt and so decrease the induced current.