Unit of pole strength of a magnet is

Unit of pole strength of a magnet is
  1. \(\mathrm{Am}^{-1}\)
  2. \(\mathrm{Am}^2\)
  3. \(\mathrm{Am}^{-2}\)
  4. Am

Solution

Dipole moment of a magnet, \(\begin{array}{ll} \Rightarrow & M=I A \\ \Rightarrow & 2 m l=I A \quad[m=\text { pole strength] } \end{array}\) \(\begin{aligned} \text {Unit of pole strength } (m) & =\frac{\text { Ampere } \times \text { metre }^2}{\text { metre }} \\ = & \frac{\mathrm{Am}^2}{\mathrm{~m}}=\mathrm{Am} \end{aligned}\)

Asked in: AP EAMCET 2020 (17 Sep Shift 1)

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