Question

the magnetic moment of a bar magnet of length 20 cm is 3.6×10^-6 AM^2. the magnetic length is 90 percentage of its geometric length. the pole strength is
a)2×10^-5Am
b)1.8×10^-5m
c)7.2×10^-8Am
d)0.55×10^-4Am​

Answer 1

Answer:

Explanation:

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.