Two small pith balls, each carrying a charge 
are attached to the ends of a light rod of length 
, which is suspended from the ceiling by a thin torsion free fiber as shown in figure. There is a uniform magnetic field B pointing straight down, in the cylindrical region of radius R around the fiber. 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 
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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