6) A circular coil with 20 turns and radius of 2cm is placed fiat on table. A un

Question

6) A circular coil with 20 turns and radius of 2cm is placed fiat on table. A uniform magnetic field of 2T is pointing 45 degrees upwards through the table. a) Suppose that the magnetic field is switched off in 0.25 second, what is the average induced emf in the coil? b) Use Lenz?s law to determine the direction of the induced emf (clockwise or counter clockwise) when viewed from above. c) Suppose that the magnetic field is kept at constant 2T but the coil is flipped over in 0.25 second, what is the average induced emf?

Explanation / Answer

a)
induced emf = N*A*dB/dt

= 20*pi*0.02^2*(2-0)*cos(45)/0.25

= 0.142 volts

b) counetr clockwise

c) same 0.142 volts

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