In the figure a charged small sphere of mass 
and the charge 
starts sliding from rest on a vertical fixed circular smooth track of radius 
from the position 
shown. There exist a uniform magnetic field of 
. Find the maximum force exerted by track on the sphere during its motion.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Maximum force will be at lowest point.
Magnetic force will not do any work.
Velocity at lowest point: 
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