Choose the correct statement
A paramagnetic material tends to move from a strong magnetic field to weak magnetic field
A magnetic material is in the paramagnetic phase below its Curie temperature
The resultant magnetic moment in an atom of a diamagnetic substance is zero
Typical domain size of a ferromagnetic material is 1 nm
The angle of dip at a place is 37° and the vertical component of the earth's magnetic field is 6 x 10-5 T. The earth's magnetic field at this place is (tan 37° = 3/ 4)
7 × 10-5 T
6 × 10-5 T
5 × 10-5 T
10-4 T
Which one of the following characteristics is not associated with a ferromagnetic material ?
It is strongly attracted by a magnet
It tends to move from a region of strong magnetic field to a region of low magnetic field
Its origin is the spin of electrons
Above the Curie temperature, it exhibits paramagnetic properties
In a certain place, the horizontal component of magnetic field is times to vertical component. The angle of dip at this place is
zero
A paramagnetic substance of susceptibility 3 x 10-4 is placed in a magnetic field of 4 x10 Am-1. Then the intensity of magnetization in the units of Am-1 is
1.33 × 108
0.75 × 10-8
12 × 10-8
14 × 10-8
At a temperature of 30°C, the susceptibility of a ferromagnetic material is found to be χ. Its susceptibility at 333°C is
χ
0.5 χ
2 χ
0.09 χ
The magnitude of the earth's magnetic field at a place is B0 and the angle of dip is δ. A horizontal conductor of length l lying magnetic north-south moves eastwards with a velocity v. The emf induced across the conductor is
zero
B0 lv sin δ
B0 lv
B0 lv cos δ
The examples of diamagnetic, paramagnetic and ferromagnetic materials are respectively
copper, aluminium, iron
aluminium, copper, iron
copper, iron, aluminium
aluminium, iron, copper
A small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is
diamagnetic
paramagnetic
ferro-magnetic
anti ferro-magnetic
The material used for permanent magnet has
low retentivity, high coercivity
high retentivity, low coercivity
high retentivity, high coercivity
low retentivity, low coercivity