A wire is bent to form a semicircle of radius a. The wire rotates about its one end with angular velocity ω. Axis of rotation being perpendicular to the plane of the semicircle. In the space, a uniform magnetic field of induction B exists along the axis of rotation as shown in figure. Then–
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A
When wire of length I rotates with angular speed omega in external magnetic field then emf is induced in that wire.
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