1.

A thin semicircular conducting ring (PQR) ofradius ‘r' is falling with its plane vertical in ahorizontal magnetic field B, as shown in figure.The potential difference developed across thering when its speed is v, is(a) Zerob) Bvu- 2 and P is at higher potnetial(c) π1Bv and R is athigh er pomenal(d) 21Bv and R is at higher potential

Answer»

Since the falling object is a ring the projection of length of the ring along right angle is equal toPR= 2R

emf=Blvemf=Blv=B2RV

and induced current in anti clock wise direction.

So,R will be with higher potential 2RBv

Hence d is the correct answer



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