A steel wire of length l has a magnetic moment M. It is bent into a semicircular arc. What is the new magnetic moment?
A steel wire of length l has a magnetic moment M. It is bent into a semicircular arc. What is the new magnetic moment?
A. `(M)/(2)`
B. `(M)/(sqrt(2))`
C. M
D. 2M
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Correct Answer - B
M=ml and
`M=sqrt((Ml)/(2)^(2)+((ml)/(2))^(2))=(ml)/(sqrt(2))=(M)/(sqrt(2))`
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