Question

A bar magnet of length 0.10 m is having magnetic moment 12 Am2. Find magnitude of magnetic
field at a point on its axis at a distance 20 cm from it.​

Answer 1

Answer:

Magnetic induction on axial line,B=

4π

μ

0

.

(d

2

−l

2

)

2

2Md

length of magnet=2l=0.01m=10cm

or,l=5cm

M=2ml=2×120×0.05

d=20cm

∴B=

4π

μ

∘

×

(0.2

2

−0.05

2

)

2

2×2×120×0.05×0.2

=341.33×1o

−6

T

=3.4×10

−4

T

Explanation:

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