A short bar magnet of magnetic moment $$1.28$$×$$10-2Am2$$ is arranged in the magnetic meridian with its south pole pointing geographic north. If $$BH=0.4$$ G , the distance between the two null points is

Question

A short bar magnet of magnetic moment $$1.28$$×$$10-2Am2$$  is arranged in the magnetic meridian  with its south pole pointing geographic north. If $$BH=0.4$$ G , the distance between the two null points  is

Infinity Learn · Accepted Answer

When a north pole of  a bar magnet is facing south , null points are obtained on axial line     Given : $$Ba=BH$$,   $$BH=0.4G=4$$×$$10$$−$$5T$$  ,  $$M=1.28$$×$$10$$−$$2$$  $$Am2We$$ know, at axis , $$BH=$$μ$$04$$$$π$$$$2Md3$$⇒$$4$$×$$10$$−$$5=10$$−$$7$$×$$2$$×$$1.28$$×$$10$$−$$2d3$$ ⇒$$d3=2$$×$$1.284$$×$$10$$−$$4$$⇒$$d3=64$$×$$10$$−$$6$$ ⇒$$d=4$$×$$10$$−$$2m=4cmThe$$ distance between two null points          $$2d=8cm$$

A short bar magnet of magnetic moment $1.28 \times 10^{- 2} {Am}^{2}$ is arranged in the magnetic meridian with its south pole pointing geographic north. If $B_{H} = 0.4$ G , the distance between the two null points is

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A short bar magnet of magnetic moment 1.28×10-2Am2 is arranged in the magnetic meridian with its south pole pointing geographic north. If BH=0.4 G , the distance between the two null points is

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A short bar magnet of magnetic moment $1.28 \times 10^{- 2} {Am}^{2}$ is arranged in the magnetic meridian with its south pole pointing geographic north. If $B_{H} = 0.4$ G , the distance between the two null points is