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a magnet 10 cm long has a pole strength of 12 amp matre find the magnitude of magnet feild strength at a point on axial at a distance of 20 cm from it?

a magnet 10 cm long has a pole strength of 12 amp matre find the magnitude of magnet feild strength at a point on axial at a distance of 20 cm from it?

Grade:12th pass

1 Answers

Vikas TU
14149 Points
4 years ago
Magnetic induction on axial line, B = (μo/4π). (2Md/(d2-l2)2)
Where, length of magnet = 2l = 10cm, => l = 5 cm
M = 2ml = 2 x 12 x 0.05 and d = 20 cm
B = (μo/4π). (2 x 2 x 12 x 0.05 x 0.2/(0.22-0.052)2)
= 341.33 x 10-7 T
=3.4 x 10-5 T

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