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1.
The time period of oscillation of a freely suspended bar magnet with usual notations is given by
2.
Two identical short bar magnets, each having magnetic moment 
, are placed a distance of 
apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is
, are placed a distance of apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is
3.
The distance of two points on the axis of a magnet from its centre is 
and 
respectively. The ratio of magnetic intensity at these points is 
. The length of the magnet will be
and respectively. The ratio of magnetic intensity at these points is . The length of the magnet will be
4.
Lines which represent places of constant angle of dip are called
5.
A short bar magnet has a length 
and a magnetic moment
. Find the magnetic field at a distance of 
from its centre on the axial line. Here, 
is negligible as compared to
.
and a magnetic moment. Find the magnetic field at a distance of from its centre on the axial line. Here, is negligible as compared to.
6.
A coil of 50 turns and area 
is pivoted about a vertical diameter in a uniform horizontal magnetic field and carries a current of 2 A. When the coil is held with its plane is 
of 2A. When the coil is held with its plane in direction, it experience a couple of 0.04 N-m; and when its plane is 
the corresponding couple is 0.03 N-m. The magnetic induction is
is pivoted about a vertical diameter in a uniform horizontal magnetic field and carries a current of 2 A. When the coil is held with its plane is of 2A. When the coil is held with its plane in direction, it experience a couple of 0.04 N-m; and when its plane is the corresponding couple is 0.03 N-m. The magnetic induction is
7.
A magnet of magnetic moment is rotated through 
in a magnetic field 
. The work done will be
is rotated through in a magnetic field . The work done will be
8.
Two bar magnets of the same mass, same length and breadth but having magnetic moments and 3M are joined together pole for pole and suspended by a string.
The time period of assembly in a magnetic field of strength H is 3 s. If now the polarity of one of the magnets is reversed and the combination is again made to oscillate in the same field, the time of oscillation is
and 3M are joined together pole for pole and suspended by a string.The time period of assembly in a magnetic field of strength H is 3 s. If now the polarity of one of the magnets is reversed and the combination is again made to oscillate in the same field, the time of oscillation is
9.
Curie's law can be written as
10.
A coil in the shape of an equilateral triangle of side 
is suspended from its vertex such that it is hanging in a vertical plane between the pole pieces of permanent magnet producing a uniform field of 
. If a current of 
is passed through the coil, what is the couple acting
is suspended from its vertex such that it is hanging in a vertical plane between the pole pieces of permanent magnet producing a uniform field of . If a current of is passed through the coil, what is the couple acting