Question

A metallic ring of radius R moves in a vertical plane in the presence of a uniform magnetic field B perpendicular to the plane of the ring. At any given instant of time its centre of mass moves with a velocity v while ring rotates in its COM frame with angular velocity w as shown in the figure. The magnitude of induced e.m.f. between points O and P is –

• A. Zero
• B. $vBR\sqrt{2}$
• C. vBR
• D. 2 vBR

Answer 1

Answer: (C)

vBR

Answer 2

e = Blv = B(R)v