In the figure, a charged sphere of mass m and charge q starts sliding from rest on a vertical fixed circular track of radius R from the position shown. There exists a uniform and constant horizontal magnetic field of induction B. The maximum force exerted by the track on the sphere is-
A
mg
B
3mg – q 
C
3mg + q 
D
mg – q 
Text Solution
Verified by ExpertsThe correct answer is:
C
Hence at 
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