A magnetic field increases from 0 to 0.25T in 1.8s Part A How many turns of...

Question

Question

A magnetic field increases from 0 to 0.25T in 1.8s

Part A

How many turns of wire are needed in a circular coil 12cm in diameter to produce an induced emf of 6.3V ?

Answer 1

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Answer #1

induced emf= NA dB/dt
Area A= pi*r^2
=pi*0.06^2
=0.01131 m^2

dB/dt =0.25 /1.8=0.1389 T/sec

induced emf= NA dB/dt
6.3=N*0.01131*0.1389
N=4010

Number of turns=4010

Answer 2

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