A metal rod of resistance R is fixed along a diameter of a conducting ring of radius r. There is a magnetic field of magnitude B perpendicular to the plane of the loop . The ring spins with an angular velocity ω about its axis. The centre of the ring is joined to its rim by an external wire W. The ring and W have no resistance. The current in W is

(a)zero

(b)Br²ω/2R

(c)Br²ω/R

(d)2Br²ω/R

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