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The magnetic field within a long, straig...

The magnetic field within a long, straight solenoid with a circular cross - section of radius r is (as shown) increasing at a rate of `alpha`.

The rate of change of flux through a circle with radius a inside the solenoid and with centre on the solenoid axis is

A

(a)`sqrt2 pia^(2)alpha`

B

(b)`(1)/(2)pia^(2)alpha`

C

(c)`pia^(2)alpha`

D

(d)`(3)/(2)pialpha`

Text Solution

Verified by Experts

The correct Answer is:
C
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