A magnetic field passing through two identical coils decreases from a magnitude
ID: 1433996 • Letter: A
Question
A magnetic field passing through two identical coils decreases from a magnitude of Bex to zero in the time interval t. The first coil has twice the number of turns as the second.
Compare the emfs induced in the coils.??
How can you change the experiment so that the emfs produced in them are the same?
How can you change the experiment so that the emfs produced in them are the same?
Rotate the first coil such that the normal of the coil makes a 90 angle with respect to the external field. Rotate the first coil such that the normal of the coil makes a 30 angle with respect to the external field. Rotate the first coil such that the normal of the coil makes a 60 angle with respect to the external field. It is impossible.Explanation / Answer
induced e.m f = E= NX d(phi)/dt , N=number of turns
but phi = B. A COS(THETA)
E1/E2 = N1/N2 = 2N/N
= 2
Rotate the first coil such that the normal of the coil makes a 60 angle with respect to the external field. then e.m f produced in them are same
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