Magnetism and Matter Test

Result

Magnetism and Matter Test - 8

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Weekly Quiz Competition

Question 1
4 / -1

If the magnet is cut into four equal parts such that their lengths and breadths are equal. Pole strength of each part is

A
m

B
m/2

C
m/4

D
m/8

Solution
Question 2
4 / -1

Magnetic moment of bar magnet is M. The work done to turn the magnet by 90° of magnet in direction of magnetic field B will be

A
zero

B
1/2 MB

C
2MB

D
MB

Solution
Question 3
4 / -1

A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be

A
M / A

B
A / M

C
MA

D
AM²

Solution
Question 4
4 / -1

The magnetism of a magnet is due to

A
the earth

B
cosmic rays

C
the spin motion of electrons

D
pressure of big magnet inside the earth
Question 5
4 / -1

If a bar magnet of length l and cross-sectional area A is cut into two equal parts as shown in figure, then the pole strength of each pole becomes

A
half

B
double

C
one-fourth

D
four times

Solution
Question 6
4 / -1

A bar magnet is held at a right angles to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it from this position. The angle of rotation is

A
60°

B
45°

C
30°

D
75°

Solution
Question 7
4 / -1

A magnetic needle is kept in a non-uniform magnetic field. It experiences

A
a torque but not a force

B
neither a force nor a torque

C
a force and a torque

D
a force but not a torque
Question 8
4 / -1

Direction of magnetic field at equatorial point is

A
parallel to M

B
perpendicular to M

C
making an angle of 45° with M

D
anti-parallel to M

Solution
Question 9
4 / -1

Consider a short magnetic dipole of magnetic length 10 cm. Its geometric length is

A
12 cm

B
8 cm

C
10 cm

D
14 cm

Solution
Question 10
4 / -1

If a magnetic dipole of dipole moment M rotated through an angle θ with respect to the direction of the field H, then the work done is

A
MH sin θ

B
MH (1 –sin θ)

C
MH cos θ

D
MH (1 – cos θ)

Solution