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A flat coil, in the shape of a spiral, h...

A flat coil, in the shape of a spiral, has a large number of turns N. The turns are wound tightly and the inner and outer radii of the coil are a and b respectively. A uniform external magnetic field (B) is applied perpendicular to the plane of the coil. Find the emf induced in the coil when the field is made to change at a rate `(dB)/(dt)`.

Text Solution

Verified by Experts

The correct Answer is:
`(piN)/(3) (a^(2) + b^(2) +ab) (dB)/(dt)`
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