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A circular loop of radius r is placed in a region where magnetic field increases with respect to time as B(t)=at then induced emf in coil a. pi r 2 a b. 3Pi r 2 a c. 2 pi r 2 a d. 4 pi r 2 a

A circular loop of radius r is placed in a region where magnetic field increases with respect to time as B(t)=at then induced emf in coil
 

a.  pi r a

b. 3Pi r a

c. 2 pi r 2 a

d. 4 pi r 2 a 

 
 

Grade:12th pass

1 Answers

Arun
25763 Points
one year ago
Dear student
 
phi = BA
 
E = d(phi)/dt = A dB/dt
 
since B = at, hence dB/dt = a
 
Hence
 
E = a* A = a * pi * r2

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