The magnetic field within a long, straight solenoid with a circular cross-section of radius r is (as shown) increasing at a rate of α . The rate of change of flux through a circle with radius a inside the solenoid, normal to the axis of the solenoid and with centre on the solenoid axis is

Question

The magnetic field within a long, straight solenoid with a circular cross-section of radius r is (as shown) increasing at a rate of α . The rate of change of flux through a circle with radius a inside the solenoid, normal to the axis of the solenoid and with centre on the solenoid axis is, 2 πa 2 α, 1 2 πa 2 α, πa 2 α, 3 2 πaα

MARKS App · Accepted Answer

Rate of change of flux through circle with radius a dϕ m dt = A dB dt = πa 2 α

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