MCQs of Magnetism and Matter

Magnetism and Matter MCQs

MCQs of Magnetism and Matter

Showing 61 to 70 out of 145 Questions

61.

What is the direction of magnetic dipole moment ?

(a)	From mid-point to any pole
(b)	From north pole to south pole
(c)	From south pole to north pole
(d)	There is no direction.

62.

The dimensional formula of magnetic pole strength is _____ .

(a)	M⁰L¹T¹A¹
(b)	M¹L¹T⁰A¹
(c)	M⁰L¹T⁰A¹
(d)	M⁰L⁰T¹A¹

63.

A magnetic pole has pole-strength 10 A m. It is placed in a magnetic field of intensity 10^-2 T. Find the force on the pole.

(a)	0.1 N
(b)	100 N
(c)	10^-3 N
(d)	10 N

64.

The unit of the magnetic pole strength is _____ .

(a)	A m²
(b)	A m
(c)	A² m
(d)	A² m²

65.

Give the value of net force on magnetic dipole in uniform magnetic field.

(a)	mB
(b)	zero
(c)	mB
(d)	$\frac{mB}{2}$

66.

At equatorial line, horizontal factor of the magnetic field of the earth is _____ .

(a)	zero
(b)	maximum
(c)	minimum
(d)	None of the above

67.

A magnet having dipole moment (m). Oscillates in horizontal plane. It oscillates under the effect of horizontal component (H). Its periodic time T is given by _____ .

(a) $2 π \sqrt{\frac{Im}{H}}$

(b) $2 π \sqrt{\frac{I}{mH}}$

(c) $2 π \sqrt{\frac{H}{mI}}$

(d) $\frac{2 π}{I} \sqrt{\frac{H}{m}}$

68.

A system has net charge zero. Can it have magnetic moment ?

(a)	Yes
(b)	No
(c)	Sometimes yes
(d)	Cannot say

69.

magnetic dipole moment of a bar magnet is

2 \hat{i} A m^{2}

and the magnetic field intensity is

10^{- 5} wb / m^{2}

in y direction. Calculate the torque on the magnet.

(a)	$2 \times 10^{- 4} \hat{i} N m$
(b)	$2 \times 10^{- 5} \hat{k} N m$
(c)	0 N m
(d)	$2 \times 10^{- 5} \hat{j} N m$

70.

Give magnitude of earth's magnetic field on its surface on tesla.

(a)	$10^{- 5}$
(b)	$10^{- 4}$
(c)	$10^{- 6}$
(d)	$10^{- 3}$

Showing 61 to 70 out of 145 Questions