A wire is bent to form a semicircle of the radius a . The wire rotates about its one end with angular velocity ω . Axis of rotation is 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 the figure. Then -

Question

A wire is bent to form a semicircle of the radius a . The wire rotates about its one end with angular velocity ω . Axis of rotation is 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 the figure. Then -, The potential difference between P and Q is equal to 2 B ω a 2, potential difference between P and Q is equal to 2 π 2 B ω a 2, P is at higher than Q, None of these

MARKS App · Accepted Answer

When wire of length l rotates with angular speed omega in external magnetic field then emf is induced in that wire. e = 1 2 B ω l 2 = 1 2 B ω 2 a 2 = 2 B ωa 2

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