Question

the magnetic moment of bar magnet of length 20cm is 3.6×10 -6 A-m2 .The magnetic length is 90% of its geometric length the pole strength of the magnet is​

Answer 1

Answer:

Correct option is

A

2×10

−5

Am

M

1

=3⋅6×10

−6

Am

2

L

1

=20 cm

magnetic length L' =

100

20×90

cm.

M

1

=PL

′

3⋅6×10

−6

=P×

100×100

20×90

P=2×10

−5

Am.