A short bar magnet is placed with its south pole pointing geographic North at a place where $B_{H} = 0.4$ gauss. The length of the magnet is $10 c m$ and pole strength is $16 A - m$ . The distance of each null point from the centre will be

0.2 m

on axial line

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0.8 c m

on axial line

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0.4 c m

on axial line

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0.2 c m

on equitorial line

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Solution

The correct option is A $0.2 m$ on axial line
Following from the hint, $0.4 = \frac{2 (16 \times 0.1) \times 10^{- 7} \times 10^{4}}{d^{3}}$
$⟹ d = 2 / 10 = 0.2 m$

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A short bar magnet is placed with its south pole pointing geographic North at a place where BH=0.4 gauss. The length of the magnet is 10cm and pole strength is 16A−m. The distance of each null point from the centre will be

The correct option is A 0.2m on axial lineFollowing from the hint, 0.4=2(16×0.1)×10−7×104d3⟹d=2/10=0.2m

A short bar magnet is placed with its south pole pointing geographic North at a place where $B_{H} = 0.4$ gauss. The length of the magnet is $10 c m$ and pole strength is $16 A - m$ . The distance of each null point from the centre will be

The correct option is A $0.2 m$ on axial line
Following from the hint, $0.4 = \frac{2 (16 \times 0.1) \times 10^{- 7} \times 10^{4}}{d^{3}}$
$⟹ d = 2 / 10 = 0.2 m$