The magnetic moment of bar magnet of length $12 c m$ of magnetic pole strength of $200 m A - m$ is _______ $A - m^{2}$ .

0.24 A - m^{2}

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0.024 A - m^{2}

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0.014 A - m^{2}

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0.64 A - m^{2}

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Solution

The correct option is B $0.024 A - m^{2}$
Given, for a magnet
m,Pole strength $= 200 m A - m = 200 \times 10^{- 3} A m$
Length of magnet $2 l = 12 c m = 0.12 m$
Now magnetic moment, $M = m \times 2 l = 200 \times 10^{- 3} \times 0.12$
$m = 0.024 A - m^{2}$

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The magnetic moment of bar magnet of length 12cm of magnetic pole strength of 200mA−m is _______ A−m2.

The correct option is B 0.024A−m2Given, for a magnetm,Pole strength=200mA−m=200×10−3AmLength of magnet 2l=12cm=0.12mNow magnetic moment,M=m×2l=200×10−3×0.12m=0.024A−m2

The magnetic moment of bar magnet of length $12 c m$ of magnetic pole strength of $200 m A - m$ is _______ $A - m^{2}$ .

The correct option is B $0.024 A - m^{2}$
Given, for a magnet
m,Pole strength $= 200 m A - m = 200 \times 10^{- 3} A m$
Length of magnet $2 l = 12 c m = 0.12 m$
Now magnetic moment, $M = m \times 2 l = 200 \times 10^{- 3} \times 0.12$
$m = 0.024 A - m^{2}$