Question

The rate of change of magnetic flux through a coil is 2x10^-3 Tm²/s.

- If the coil has 500 turns, determine the induced emf in the coil.

- If the resistance of the coil is 10 Ohms, determine the current in the coil.

Answer 1

I am assuming 2*10^-3 T.m^2/s is the rate of change of magnetic flux through one turn.

induced emf = the rate of change of magnetic flux through the coil

= N*rate of the change of magnetic flux through one turn

= 500*2*10^-3

= 1 volts

induced current = induced emf/R

= 1/10

= 0.1 A

If 2*10^-3 T.m^2/s is the rate of change of magnetic flux through the whole coil

induced emf = the rate of change of magnetic flux through the coil

= 2*10^-3 volts

induced current = induced emf/R

= 2*10^-3/10

= 2*10^-4 A