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QNEET-2013-Ph-1518: NEET 2013 Physics - Class 12 NEET-2013-Ph-1518 Solution: A bar magnet of length 'l' and magnetic dipole moment 'M' is…

A bar magnet of length 'l' and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be 2πM\frac{2}{\pi}M M2\frac{M}{2} M 3πM\frac{3}{\pi}M

Multiple Choice Options

  • A 2πM{2 \over \pi }M � 2 _ M
  • B M2{M \over 2} 2 M _
  • C M
  • D 3πM{3 \over \pi }M � 3 _ M

Step-by-Step Verified Solution

If the magnetic pole has a strength �m� then, M = m _ l When the bar magnet is bent in the form of an arc as shown in figure then l = � 3 _ r = � r 3 _ r = 3 l � New magnetic dipole moment M' = m _ 2rsin 30 o = m _ 2 _ 3 l � _ 1 2 = 3 m l � = 3 M �

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