When a ferromagnetic material is heated above its Curie temperature it
gets demagnetised
becomes diamagnetic
behaves like a paramagnetic substance
remains unaffected
A hydrogen atom is paramagnetic. A hydrogen molecule is
diamagnetic
paramagnetic
ferromagnetic
none of these
A bar magnet of magnetic moment is placed in the magnetic field . The Torque acting on the magnet is :
At a certain place, magnitude of horizontal and vertical components of a magnetic field are same. The total intensity of magnetic field at that place will be
H
H2
2H
The magnetic lines of force inside a bar magnet
are from north-pole to south-pole of the magnet
do not exist
depend upon the area of cross-section of the bar magnet
are from south-pole to north-pole of the magnet
Curie temperature is the temperature above which
a ferromagnetic material becomes paramagnetic
a paramagnetic material becomes diamagnetic
a ferromagnetic material becomes diamagnetic
a paramagnetic material becomes ferromagnetic
Which one of the following is ferromagnetic?
Gold
Wood
Manganese
Nickle
D.
Nickle
Ferromagnetic substances are those, when placed in magnetic field, acquire a strong magnetism in the direction of field Nickle shows this property.
If the earth field induction at a place is 0.36 gauss and the angle of dip is 60°, the horizontal and vertical components of the field will be respectively
0.18 gauss, 0.18 gauss
0.98 gauss, 0.9 gauss
1.08 gauss, and 1.08 gauss
1.07 gauss, 0.11 gauss
Magnetic field intensify at the centre of coil of 50 turns, 0.5 m radius and carrying a current of 2A, is
5x 10-5 T
3 x 10-5 T
1.25 × 10-4 T
0.5 x 10-5 T
A straight conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to the magnetic field of intensity of 0.9 Wb/m2. The induced emf across the conductor will be
7.25 V
5.54 V
1.25 V
2.52 V