MCQ
The magnetic susceptibility is
- ✓$\chi = \frac{I}{H}$
- B$\chi = \frac{B}{H}$
- C$\chi = \frac{M}{V}$
- D$\chi = \frac{M}{H}$
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Reason : For above given system the equation $\frac{1}{u} + \frac{1}{v} = \frac{1}{f}$ gives $v = \infty $.
Assertion $(A)$ and the other is labelled as Reason$(R)$
$Assertion$ $(A)$ : Work done by electric field on moving a positive charge on an equipotential surface is always zero.
$Reason$ $(R)$ : Electric lines of forces are always perpendicular to equipotential surfaces.
In the light of the above statements, choose the most appropriate answer from the options given below