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Class 12 NEET Physics Magnetism and Matter Questions
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© examsnet.com
Question : 50
Total: 50
The work done in turning a magnet of magnetic moment
M
by an angle of
90
°
from the meridian, is
n
times the corresponding work done to turn it through an angle of
60
°
.
The value of
n
is given by
(1995)
1
2
1
4
2
1
Validate
Solution:
Angle of magnet
(
θ
)
=
90
°
and
60
°
.
Work done in turning the magnet through
90
°
.
(
W
1
)
=
M
B
(
cos
0
°
−
cos
90
°
)
=
M
B
(
1
−
0
)
=
M
B
Similarly
W
2
=
M
B
(
cos
0
°
−
cos
60
°
)
=
M
B
(
1
−
1
2
)
=
M
B
2
Therefore
W
1
=
2
W
2
or
n
=
2
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