MCQs of Magnetism and Matter

Magnetism and Matter MCQs

MCQs of Magnetism and Matter

Showing 71 to 80 out of 145 Questions

71.

Static magnitude constant

\frac{1}{4 {πε}_{0}}

is similar to the magnetic constant _____ .

(a)	$\frac{μ_{0}}{4 π}$
(b)	$\frac{μ_{0}}{2 π}$
(c)	$\frac{μ_{0}}{π}$
(d)	$μ_{0}$

72.

SI unit of the ratio of electric flux and magnetic flux is _____ .

(a)	m
(b)	${ms}^{- 1}$
(c)	${ms}^{- 2}$
(d)	ms

73.

A magnet of magnetic dipole moment 5.0 A m² is lying in a uniform magnetic field of 7×10^-4 T auch that its dipole moment vector makes an angle of 30º with the field. The work done in increasing this from 30º and 45º is about _____ J.

(a)	5.56 × 10^-4
(b)	24.74 × 10^-4
(c)	30.3 × 10^-4
(d)	5.50 × 10^-3

74.

If δ₁ and δ₂ are observed magnetic dip angle in two mutually perpendicular planes and δ is true of angle of dip at the place, then _____ .

(a)	$c o t^{2} δ = c o t^{2} δ_{1} + c o t^{2} δ_{2}$
(b)	$\tan^{2} δ = \frac{\tan^{2} δ_{1}}{\tan^{2} δ_{2}}$
(c)	$c o t^{2} δ = \frac{c o t^{2} δ_{1}}{c o t^{2} δ_{2}}$
(d)	0

75.

Net magnetic flux passing through close surface is _____ .

(a)	$\frac{m}{2 π}$
(b)	$\frac{m}{ε_{0}}$
(c)	$\frac{Σ m}{4 π}$
(d)	0

76.

At which place magnetic dip angle is maximum ?

(a)	On magnetic north pole and magnetic south pole
(b)	Only on magnetic north pole
(c)	Only on magnetic south pole
(d)	On geographic north pole

77.

The relative permeability of a medium is 0.055. What is its magnetic susceptibility ?

(a)	0.925
(b)	-0.945
(c)	-0.935
(d)	1.045

78.

A magnet of magnetic dipole moment 5.0 Am² is lying in a uniform magnetic field of 7 × 10^-4T such that its dipole moment vector makes an angle of 30° with the field. The work done in increasing this angle from 30° to 45° is about _____ J

(a)	5.56 × 10^-4
(b)	24.74 × 10^-4
(c)	30.3 × 10^-4
(d)	5.50 × 10^-4

79.

A bar magnet is oscillating in Earth's magnetic field with periodic time T. If similar magnet with the same mass and volume has magnetic dipole moment, which is 4 times that of this magnet, then its periodic time will be _____.

(a)	$\frac{T}{2}$
(b)	2T
(c)	T
(d)	4T

80.

A circular loop carrying current I is replaced bt a bar magnet of equivalent magnetic dipole moment. The point on the loop is lying _____ .

(a)	on equatorial plane of magnet
(b)	on axis of the magnet
(c)	(A) and (B) both
(d)	except equatorial plane or axis of bar magnet

Showing 71 to 80 out of 145 Questions