Magnetism and Matter Test

Result

Magnetism and Matter Test - 21

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Question 1
4 / -1

Three similar bar magnets are placed to form an equilateral triangle as shown in Fig. The magnetic moment of each magnet is M. What is the magnetic moment of the system?

A
M

B
Zero

C
2 M

D
M/2

Solution
Question 2
4 / -1

A uniform magnetic needles is suspended from its centre by a thread. Its upper end is now loaded with a mass of 50 milligram, and the needle becomes horizontal. If the strength of each pole is 98.1 ab amp-cm and g = 981 cm/s², then the vertical component of earth’s magnetic induction is

A
0.50 gauss

B
0.25 gauss

C
0.005 gauss

D
0.05 gauss

Solution
Question 3
4 / -1

A magnet 20 cm long with its poles concentrated at its ends is placed vertically with its north pole on the table. At a point due 20 cm south (magnetic) of the pole, a neutral point is obtained. If H = 0.3 gauss, then the pole strength of the magnet is approximately

A
185 ab-amp cm

B
185 amp.m

C
18.5 ab-amp cm

D
18.5 amp m

Solution
Question 4
4 / -1

An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be

A
M

B

C

D
Mπ

Solution
Question 5
4 / -1

Unit of magnetic flux density (or magnetic induction) is

A
Tesla

B
Weber/metre2

C
Newton/ampere-metre

D
All of these
Question 6
4 / -1

Magnetic intensity for an axial point due to a short bar magnet of magnetic moment M is given by

A

B

C

D

Solution
Question 7
4 / -1

A magnetic dipole is placed in a uniform magnetic field. The net magnetic force on the dipole

A
Is always zero

B
Depends on the orientation of the dipole

C
Can never be zero

D
Depends on the strength of the dipole

Solution
Question 8
4 / -1

If a magnet of pole strength m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will be

A
m/4

B
m/2

C
m/8

D
4m

Solution
Question 9
4 / -1

The distance of two points on the axis of a magnet from its centre is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be

A
5 cm

B
25 cm

C
10 cm

D
20 cm

Solution
Question 10
4 / -1

Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio

A
1 : 1

B
2 : 3

C
2 : 1

D
3 : 2

Solution