A bar magnet with its south pole pointing toward a coil of wire of cross-section

Question

A bar magnet with its south pole pointing toward a coil of wire of cross-sectional area 0.020 m2and seven turns is thrust into the coil as shown in the figure. If the rate of change in the strength of the magnetic field caused by the motion of the bar magnet is 0.040 T/s, what is the magnitude of the induced emf in that coil of wire?

A bar magnet with its south pole pointing toward a coil of wire of cross-sectional area 0.020 m^2and seven turns is thrust into the coil as shown in the figure. If the rate of change in the strength of the magnetic field caused by the motion of the bar magnet is 0.040 T/s, what is the magnitude of the induced emf in that coil of wire?

Explanation / Answer

As we know

Induced EMF = - Nd/dt

= N*A*dB/dt

= 7*0.020*0.040

= 5.6*10-3 V

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