The effective length of a magnet is 31.4 cm and its pole strength is 0.5 Am . The magnetic moment, if it is bent in the form of a semicircle will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Circumference of a circle of radius 
is 
.
Magnetic moment ( 
) is a measure of the strength of a magnetic source.
It is denned as pole strength 
multiplied by distance 
Circumference of semicircle is 
.
Given, 
So, magnetic moment 
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