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NEET Physics : Magnetism and Matter

Multiple Choice Questions

71.

The magnetic susceptibility of a material of a rod is 499. The absolute permeability of vacuum is 4 $π$ x 10^-7 Hm^-1 . The absolute permeability of the material of rod is

$π \times 10^{- 4} {Hm}^{- 1}$
$2 π \times 10^{- 4} {Hm}^{- 1}$
$3 π \times 10^{- 4} {Hm}^{- 1}$
$4 π \times 10^{- 4} {Hm}^{- 1}$

72.

At a certain place, the horizontal component of earth's magnetic field is $\sqrt{3}$ times the vertical component. The angle of dip at that place is

30°
60°
45°
90°

73.

Magnetic field intensity H at the centre of a circular loop of radius r carrying current I emu is

$\frac{r}{I} oersted$
$\frac{2 πI}{r} oersted$
$\frac{I}{2 πr} oersted$
$\frac{2 πr}{I} oersted$

74.

The intensity of magnetization of a bar magnet is 5.0 x 10⁴ Am^-1.The magnetic length and the area of cross section of the magnet are 12 cm and 1cm² respectively. The magnitude of magnetic moment of this bar magnet is (in SI unit)

0.6
1.3
1.24
2.4

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NEET Physics : Magnetism and Matter

Multiple Choice Questions