1.

A coil with resistance R is placed in a magnetic field. The flux linked with the coil is ϕ. If the magnetic field suddenly reverses in direction, how much charge will circulate in the coil? (a) ϕ/2R (b) ϕ/R (c) 2ϕ/R (d) zero

Answer»

Correct Answer is: (c) 2ϕ/R 

The total charge circulating in a coil is equal to

total change in flux / total resistance

Here, reversing the magnetic field causes a change of flux by 2ϕ.

∴ Q = 2ϕ/R.



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