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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 |
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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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