Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 69

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Weekly Quiz Competition

Question 1
4 / -1

Four wires each of length 2.0 metres are bent into four loops P, Q, R and S and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct

A
Couple on loop P will be the highest

B
Couple on loop Q will be the highest

C
Couple on loop R will be the highest

D
Couple on loop S will be the highest
Question 2
4 / -1

The expression for the torque acting on a coil having area of cross-section A, number of turns n, placed in a magnetic field of strength B, making an angle θ with the normal to the plane of the coil, when a current i is flowing in it, will be

A
ni AB tan θ

B
ni AB cos θ

C
ni AB sin θ

D
ni AB
Question 3
4 / -1

The pole pieces of the magnet used in a pivoted coil galvanometer are

A
Plane surfaces of a bar magnet

B
Plane surfaces of a horse-shoe magnet

C
Cylindrical surfaces of a bar magnet

D
Cylindrical surfaces of a horse-shoe magnet
Question 4
4 / -1

A conductor in the form of a right angle ABC with AB = 3 cm and BC = 4 cm carries a current of 10 A. There is a uniform magnetic field of 5 T perpendicular to the plane of the conductor. The force on the conductor will be

A
1.5 N

B
2.0 N

C
2.5 N

D
3.5 N

Solution
Question 5
4 / -1

The coil of a galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is 10^–8 N-m/radian. The magnetic field between the pole pieces is 5 T. The current sensitivity of this galvanometer will be

A
5 × 10⁴ rad/μamp

B
5 × 10^–6 per amp

C
2 × 10^–7 per amp

D
5 rad /μ amp

Solution
Question 6
4 / -1

A rectangular coil 20 cm × 20 cm has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is

A
Zero

B
200 N–m

C
2 N–m

D
10 N–m

Solution
Question 7
4 / -1

In hydrogen atom, the electron is making 6.6 × 10¹⁵ rev/sec around the nucleus in an orbit of radius 0.528 Å. The magnetic moment (A–m²) will be

A
1 × 10^–15

B
1 × 10^–10

C
1 × 10^–23

D
1 × 10^–27

Solution
Question 8
4 / -1

Three long, straight and parallel wires carrying current are arranged as shown in the figure. The wire C which carries a current of 5.0 amp is so placed that it experiences no force. The distance of wire C from wire D is then

A
9 cm

B
7 cm

C
5 cm

D
3 cm

Solution
Question 9
4 / -1

A coil carrying electric current is placed in uniform magnetic field, then

A
Torque is formed

B
E.M.F is induced

C
Both (1) and (2) are correct

D
None of the above
Question 10
4 / -1

A power line lies along the east-west direction and carries a current of 10 ampere. The force per metre due to the earth\'s magnetic field of 10^–4 tesla is

A
10^–5 N

B
10^–4 N

C
10^–3 N

D
10^–2 N

Solution