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Calculate magnetic field due to a bar ma...

Calculate magnetic field due to a bar magnet 2 cm long having pole strength 100 Am at a point 20 cm from centre of bar magnet .
(i) On axial point `" "` (ii) On normal bisector

Text Solution

Verified by Experts

(i) ` B = (mu _(0))/(4pi) (2M)/(r ^(3))`
` M = q _(m) xx L`
` = 100 xx 2xx 10 ^(-2) Am ^(2)`
` = 2A m^(2)`
` B = 10 ^(-7) xx (2xx2)/((0.2)^(3))`
`= 10 ^(-7) xx (4 )/(B xx 10 ^(-3))`
` = 0.5 xx 10 ^(-4)`
`= 5 xx 10 ^(-5)T`
(ii) ` B = (mu _(0))/(4pi) (M)/(r ^(3))`
` B = 19 ^(-7) xx (2)/((0.2)^(3))`
`=2.5 xx 10 ^(-5)T`
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