A short bar magnet of magnetic moment is placed in a uniform magnetic field of .
The magnet is in stable equilibrium when the potential energy is
0.064
zero
Get Answer
For stable equilibrium
The magnetic moment of a magnet is . It is suspended in a magnetic field of intensity weber/ . The couple acting upon it when deflected by from the magnetic field is
A magnet of magnetic moment 20 C.G.S. units is freely suspended in a uniform magnetic field of intensity
0.3 C.G.S. units. The amount of work done in deflecting it by an angle of in C.G.S. units is
6
3
Work done
A magnet of length and pole strength A.m. is kept in a magnetic field of at an angle . The couple acting on it is .
7.5
3.0
1.5
6.0
The magnetic dipole moment of a coil is joule/ tesla and it is lined up with an external magnetic
field whose strength is . Then the work done in rotating the coil (for ) is
None of these.
The potential energy of a magnetic dipole placed in an external magnetic dipole is .
Therefore, work done in rotating the dipole is-
A bar magnet having a magnetic moment of , is placed along the direction of uniform
magnetic field of magnitude . The work done in rotating the magnet slowly through from the direction of field is :
Work done is rotating a dipole for to is given by
A short bar magnet, placed with its axis at with an external magnetic field of , experiences a torque of magnitude . The magnetic moment of the bar magnet is (in units of )
4
0.2
0.5
0.4
Torque,
A bar magnet having centre has a length of . Point is in the broad side-on and is in the end side-on position with metres. The ratio of magnetic intensities at and is
Magnetic intensity on end side -on position is twice than broad side on position.
The force between two short bar magnets with magnetic moments and whose centres are metres apart is 8 when their axes are in same line. if the separation is increased to , the force between them is reduced to
As and becomes twice, therefore,
F becomes times .
Two points and are situated at a distance and respectively from the nearer pole of a magnet long. The ratio of magnetic field at and is
exactly
approximately
8:1 approximately
1:1 approximately
Taking distances from the centre of the magnet,
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