If a steel wire of length l and magnetic moment M is bent into a semicircular arc, the new magnetic moment is
A
B
C
D
M
Text Solution
Verified by ExpertsThe correct answer is:
C
When wire is bent in the form of semicircular arc, then 
The radius of semicircular arc, 
Distance between two end points of semicircular wire.
Magnetic moment of semicircular wire
But ml is the magnetic moment of straight wire,
i.e. 
New magnetic moment 
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