Magnetism and Matter Test

Result

Magnetism and Matter Test - 23

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Weekly Quiz Competition

Question 1
4 / -1

Points A and B are situated perpendicular to the axis of a 2 cm long bar magnet at large distances X and 3X from its centre on opposite sides. The ratio of the magnetic fields at A and B will be approximately equal to

A
1 : 9

B
2 : 9

C
27 : 1

D
9 : 1

Solution
Question 2
4 / -1

Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres 40 cm east and 50 cm west of magnetic needle. It the needle remains undeflected, the ratio of their magnetic moments M₁ : M₂ is

A
4 : 5

B
16 : 25

C
64 : 125

D
2 : √5

Solution
Question 3
4 / -1

If a bar magnet of magnetic moment M is freely suspended in a uniform magnetic field of strength B, the work done in rotating the magnet through an angle θ is

A
MB(1 – sin θ)

B
MB sin θ

C
MB cos θ

D
MB(1 – cos θ)
Question 4
4 / -1

Two small bar magnets are placed in a line with like poles facing each other at a certain distance d apart. If the length of each magnet is negligible as compared to d, the force between them will be inversely proportional to

A
d

B
d²

C

D
d⁴

Solution
Question 5
4 / -1

A magnet of magnetic moment M is situated with its axis along the direction of a magnetic field of strength B. The work done is rotaing it by an angle of 180° will be

A
–MB

B
+MB

C
0

D
+2MB

Solution
Question 6
4 / -1

Two identical short bar magnets, each having magnetic moment of 10 Am², are arranged such that their axial lines are perpendicular to each other and their centres be along the same straight line in a horizontal plane. If the distance between their centres is 0.2 m, the resultant magnetic induction at a point midway between them is (µ₀ = 4π × 10^–7 Hm^–1)

A

B

C

D

Solution
Question 7
4 / -1

A bar magnet of length 10 cm and having the pole strength equal to 10^–3 weber is kept in a magnetic field having magnetic induction (B) equal to 4 π × 10^–3tesla. It makes an angle of 30° with the direction of magnetic induction. The value of the torque acting on the magnet is

A
2π × 10^–7N × m

B
2 π × 10^–5 N × m

C
0.5 N × m

D
0.5 × 10² N × m (µ₀ =4 π × 10^–7 weber/amp × m)

Solution
Question 8
4 / -1

Magnetic field intensity is defined as

A
Magnetic moment per unit volume

B
Magnetic induction force acting on a unit magnetic pole

C
Number of lines of force crossing per unit area

D
Number of lines of force crossing per unit volume
Question 9
4 / -1

If the magnetic flux is expressed in weber, then magnetic induction can be expressed in

A
Weber/m²

B
Weber/m

C
Weber-m

D
Weber-m²

Solution
Question 10
4 / -1

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

A
A force and torque

B
A force but not a torque

C
A torque but not a force

D
Neither a torque nor a force