Question

Q.8) Obtain an expression for magnetic field due to bar magnet at point
along its axis.
A short magnetic dipole has magnetic moment 0.7 Am^2 calculate
its axial magnetic field at a distance of 10 cm from the center of
magnetic dipole. (Given: -

​

Answer 1

Explanation:

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Answer 2

Answer:

7

×10

−7

T

Explanation:

Magnetic field due to a bar magnet of magnetic dipole moment M at a

distance from it in a direction θ with its magnetic moment is

B=

4π

μ

0

.

r

3

M

(3cos

2

θ+1)

where,

4π

μ

0

=10

−7

Tm/A

Given,

M=2Am

2

r=1m

θ=60

0

⇒B=(10

−7

Tm/A)×

(1m)

3

2Am

2

×

(

4

3

+1)

=

7

×10

−7

T