Magnetism and Matter Test

Result

Magnetism and Matter Test - 20

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Weekly Quiz Competition

Question 1
4 / -1

The incorrect statement regarding the lines of force of the magnetic field B is

A
Magnetic intensity is a measure of lines of force passing through unit area held normal to it

B
Magnetic lines of force form a close curve

C
Inside a magnet, its magnetic lines of force move from north pole of magnet towards its south pole

D
Due to a magnet, magnetic lines of force never cut each other
Question 2
4 / -1

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed ω. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

A
ω and q

B
ω, q and m

C
q and m

D
ω and m

Solution
Question 3
4 / -1

When a magnetic needle is kept in a non-uniform magnetic field, it experiences:

A
a force and a torque

B
only a force

C
only a torque

D
neither a force nor a torque
Question 4
4 / -1

The magnetic needle of a tangent galvanometer is deflected at an angle 30º due to a magnet. The horizontal component of earth’s magnetic field 0.34 × 10^–4 T is along the plane of the coil. The magnetic intensity is

A

B

C

D

Solution
Question 5
4 / -1

The magnetic field lines due to a bar magnet are correctly shown in Fig

A

B

C

D
Question 6
4 / -1

The magnetic lines of force inside a bar magnet

A
do not exist

B
depends on area of cross section of the bar magnet

C
are from N-pole to S-pole of the magnet

D
are from S pole to N-pole of the magnet
Question 7
4 / -1

A magnet of length 0.1 m and pole strength 10^–4 Am is kept in a magnetic field of 30 Wb/m² at an angle of 30º. The couple acting on it is…× 10^–4 N -m

A
7.5

B
1.5

C
4.5

D
6.0

Solution
Question 8
4 / -1

Force between two identical short bar magnets whose centres are r metre apart is 8.1 N, when their axes are along the same line. If separation is increased to 3 r and the axis are rearranged perpendicularly, the force between them would become

A
2.4 N

B
1.2 N

C
0.1 N

D
0.15 N

Solution
Question 9
4 / -1

A coil of 50 turns and area 1.25 × 10^–3 m² is pivoted about a vertical diameter in a uniform horizontal magnetic field and carries a current of 2A. When the coil is held with its plane in N-S direction, it experiences a couple of 0.04 N-m; and when its plane is east-west, the corresponding couple is 0.03 N-m. The magnetic induction is

A
0.2 T

B
0.3 T

C
0.4 T

D
0.5 T

Solution
Question 10
4 / -1

A deflection magnetometer is adjusted in the usual way. When a magnet is introduced, the deflection observed is θ, and the period of oscillation of the needle in the magnetometer is T. When the magnet is removed, the period of oscillation is T_o. The relation between T and T_o is

A

B

C

D

Solution