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Dipole in a Uniform Magnetic Field
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A current loop with a current I is place
Question
A current loop with a current
I
is placed in a magnetic field
B
, the potential energy will not depend upon:
A
orientation of loop with respect to direction of magnetic field.
B
alignment of magnetic moment.
C
current in the loop.
D
material of the wire.
Easy
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Updated on : 2022-09-05
Solution
Verified by Toppr
Correct option is D)
For the current loop ABCD in magnetic field
B
Let current flowing = I
Area enclosed = A and
μ
= magnetic dipole moment.
Now torque expression
τ
=
μ
×
B
ext
τ
=
μ
B
ext
sin
θ
Thus potential energy,
U
=
∫
τ
d
θ
=
∫
μ
B
sin
θ
d
θ
U
=
μ
B
cos
θ
As
U
=
I
A
B
since
Thus U depends on
i) orientation
(
θ
)
ii) Alignment of magnetic moment
(
μ
)
iii) Current = I
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