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Byju's Answer
Standard XII
Physics
Solenoid Core in Magnetic Field
A bar magnet ...
Question
A bar magnet of magnetic moment
200
A
−
m
2
is suspended in a magnetic field of intensity
0.25
N
/
A
−
m
.
The couple required to deflect it through
30
∘
is
A
50 N - m
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B
25 N - m
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C
20 N - m
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D
15 N - m
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Solution
The correct option is
B
25 N - m
τ
=
M
B
s
i
n
θ
τ
=
200
×
0.25
×
s
i
n
30
∘
=
25
N
×
M
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