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?
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A steel wire of length l has a magnetic moment M. It is bent into a semicircular arc. What is the new magnetic moment? ... `M/l` C. `(2M)/(pi)` D. `M`
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