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Class 12
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Physics
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Magnetism and Matter
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Dipole in a Uniform Magnetic Field
Dipole in a Uniform Magnetic Field
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Dipole in Uniform Magnetic Field
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Dipole in Uniform Magnetic Field
11 mins
Quick Summary With Stories
Dipole in Uniform Magnetic field
4 mins
Potential Energy of a Magnet in Magnetic Field
3 mins
Problem on Magnetic Dipoles
2 mins
Important Questions
Derive an expression for the magnetic dipole moment of a revolving electron.
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Obtain an expression for the orbital magnetic moment of an electron rotating about the nucleus in an atom.
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A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment
μ
is given by
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A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. the energy required to rotate it by
6
0
o
is
W
, Now the torque required to keep the magnet in this new position is.
Medium
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A particle of charge q and mass m moves in a circular orbit of radius r with angular speed
ω
. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on
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A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field
B
ˉ
. The work done to rotate the loop by 30 about an axis perpendicular to its plane is:
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Write the expression for magnetic potential energy of a magnetic dipole kept in a uniform magnetic field and explain the terms.
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A bar magnet of magnetic moment
1
.
5
J
T
−
1
lies aligned with the direction of a uniform magnetic field of 0.22 T.
(a) What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: (i) normal to the field direction, (ii) opposite to the field direction?
(b) What is the torque on the magnet in cases (i) and (ii)?
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A circular loop of area
1
c
m
2
, carrying a current of
1
0
A, is placed in a magnetic field of
0
.
1
T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is?
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A short bar magnet of magnetic moment
0
.
4
J
T
1
is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
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