Q151 / 160 · TS EAMCET 2020 (09 Sep Shift 2) · Physics

A bar magnet having magnetic moment $M$ is bent as an arc. Its magnetic moment

  • Correct answer
    A
    decreases
  • B
    increases
  • C
    does not change
  • D
    may increase or decrease

Solution

Magnetic moment of a bar magnet, $\mathbf{M}=m(2 \mathbf{l})$ $=$ pole strength $\times$ distance between poles When bar magnet is bent as an arc distance between poles decreases whereas pole strength remains same. So, its magnetic moment also, decreases.

Hence, the correct answer is option: 'A'.

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