Question

a bar magnet of moment of inertia of 500g cm^2 makes 10 oscillation per minute in a horizontal plane what is the magnetic moment if the horizontal component of earth's magnetic field is 0.36 gauss? ​

Answer 1

Explanation:

ANSWER

Time period is given by

T=2π

MB

I

T

2

=4π

2

×

MB

I

M=4π

2

×

T

2

B

I

Time period T=

20

15

=0.75 s

∴ M=4π

2

×

16π

2

×10

−5

×(0.75)

2

9×10

−5

M=

4×0.5625

9

M=

2.25

9

=4A−m

2