A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf is

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Aicharya · Accepted Answer

Flux through the loop $\phi=B A \cos \theta=B A \cos \omega t$ where $\theta=\omega t$ is the angle made by area vector with magnetic field at any instant. $\text {emf induced }=-\frac{d \phi}{d t}=B A \omega \sin \omega t$ From the above graph, we have 4 points of change of direction in emf induced, in two time periods, T each. Thus there two changes in one time period (i.e twice per revolution).

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf is

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