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Magnetic Intensity

Two short bar...

Question

Two short bar magnets of same magnetic moment 0.25 Am $^{2}$ are arranged antiparallel to each other 1 m apart. The induction field strength at the centre of the common equatorial line joining the centres is

A

zero

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B

2 \times 10^{- 5}

T

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C

10^{- 5}

T

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D

4 \times 10^{- 7}

T

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Solution

The correct option is A zero
$B_{1} = B_{2}$
$∴ B_{N e t} = 0$
$∵ (m_{1} = m_{2} = m)$
$B_{1} = B_{2} = \frac{μ_{0} m}{4 π d^{2}}$

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