Q11 As shown in the diagram below, a circular loop of wire sits on the plane of

Question

Q11 As shown in the diagram below, a circular loop of wire sits on the plane of the paper. The radius of the loop is r. The loop is attached to a straight insulating rod about which it can rotate. A uniform magnetic field points into the page The initial angle between the area vector of the loop and the magnetic field is O (You should recall that the area of a circle of radius r is a) Write the general algebraic expression for Faraday's law which relates the induced EMF, the magnetic flux through the loop,0 and time t

Explanation / Answer

according to faraday's law

induced emf is equal to rate of change of magnetic flux and is induced in opposite direction so

induced EMF = -d(phi)/dt

phi = magnetic flux through loop

when lopp is stationary there is some constant flux (B * pi (R^2))

since it is not changing with time so induced EMF = 0

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