If a bar magnet of pole strength and magnetic moment is cut perpendicular to its axis in two equal halves then its new pole strength and magnetic moment are respectively
and
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When a bar magnet cut perpendicular to its axis into two equal parts then and length
A small bar magnet placed with its axis at with an external field of experiences a torque of .
The minimum work required to rotate it from its stable to unstable equilibrium position is :
Here,
Torque on a bar magnet :
.
Position of stable equilibrium
Position of unstable equilibrium
Minimum work required to rotate bar magnet from stable to unstable equilibrium
For bar magnet effective length related with geometrical length as
A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis. Of the following physical quantities the one which remains unchanged is
pole strength
magnetic moment
intensity of magnetization
None of these
A steel wire of length has a magnetic moment . It is bent in L-shape (Figure). The new magnetic
moment is
Magnetic moment,
Therefore distance between poles
So, .
Magnetic dipole moment is a vector quantity directed from
south pole to north pole
north pole to south pole
east to west
west to east
A thin bar magnet of length and breadth 2 b pole strength and magnetic moment is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is
therefore, pole strength becomes half (i.e. ).
The force between magnetic poles when their pole strength and the distance between them both doubled is
twice the previous value
half the previous value
four times the previous value
not change
A coil in the shape of an equilateral triangle of side lies in a vertical plane between the pole pieces of permanent magnet producing a horizontal magnetic field . The torque acting on the coil when a current of 0.2 is passed through it and its plane becomes parallel to the magnetic field will be . The value of is
3
5
7
9
Given,
Side of triangle,
Magnetic field,
Current,
Area of equilateral triangle, .
Torque,
A bar magnet of magnetic moment , is placed in magnetic field of induction . The torque exerted on it is
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