Which factor is most essential for the induction of the electric current?

a) the use of strong magnets for the process
b) the movement of the magnet through the coil
c) the use of very long coils for the process
d) the use of nonmagnetic material to make the coil

Option A.

Explanation:

In order to create many magnetic field lines, stronger magnets are used so that the cutting of the magnetic field lines will be more frequent creating a higher magnetic induction.

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