Two small pith balls, each carrying a charge q are attached to the ends of a light rod of length d, which is suspended from the ceiling by a thin torsion free fibre as shown in figure. There is a uniform magnetic field B pointing straight down, in the cylindrical region of radius R around the fibre. The system is initially at rest. If the magnetic field is turned off, which of the following happen to the system -
A
It rotate with an angular momentum qBR 2
B
It does not move at all
C
It rotate with an angular momentum 
D
None of the above
Text Solution
Verified by ExpertsThe correct answer is:
C
Change in angular momentum of whole system
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