If a steel wire of length l and magnetic moment M is bent into a sem-circular arc, then 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 semi-circular arc, then 
.
The radius of sem-circular arc, 
Distance between two end points of semi-circular wire
Magnetic moment of semicircular wire
But ml is the magnetic moment of wire, i.e. 
New magnetic moment 
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