Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 28

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Weekly Quiz Competition

Question 1
4 / -1

A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 millitesla inside the solenoid will be approximately

A
8.0 A

B
4.0 A

C
2.0 A

D
1.0 A

Solution
Question 2
4 / -1

A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of the magnetic induction at the centre due to the current in the ring is

A
Proportional to 2 (180°– θ)

B
Inversely proportional to r

C
Zero, only if θ =180°

D
Zero for all value of θ

Solution
Question 3
4 / -1

A current of 1 ampere is passed through a straight wire of length 2.0 metres. The magnetic field at a point in air at a distance of 3 metres from either end of wire and lying on the axis of wire will be

A

B

C

D
Zero
Question 4
4 / -1

A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is

A

B

C

D
Zero
Question 5
4 / -1

A straight wire of length (π²) metre is carrying a current of 2A and the magnetic field due to it is measured at a point distant 1 cm from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be

A
50 : 1

B
1 : 50

C
100 : 1

D
1 : 100

Solution
Question 6
4 / -1

Due to 10 ampere of current flowing in a circular coil of 10cm radius, the magnetic field produced at its centre is 3.14 × 10^–3 weber/m². The number of turns in the coil will be

A
5000

B
100

C
50

D
25

Solution
Question 7
4 / -1

There are 50 turns of a wire in every cm length of a long solenoid. If 4 ampere current is flowing in the solenoid, the approximate value of magnetic field along its axis at an internal point and at one end will be respectively

A
12.6 × 10^–3 weber/m², 6.3 × 10^–3 weber/m²

B
12.6 × 10^–3 weber/m², 25.1 × 10^–3 weber/m²

C
25.1 × 10^–3 weber/m², 6.3 × 10^–3 weber/m²

D
25.1 × 10^–5 weber/m², 6.3 × 10^–5 weber/m²

Solution
Question 8
4 / -1

A steady electric current is flowing through a cylindrical conductor

A
The magnetic field in the vicinity of the conductor is zero

B
The electric field in the vicinity of the conductor is non-zero

C
The magnetic field at the axis of the conductor is zero

D
The electric field at the axis of the conductor is zero

Solution
Question 9
4 / -1

A vertical wire kept in Z-X plane carries a current from Q to P (see figure). The magnetic field due to current will have the direction at the origin O along

A

B

C

D
Question 10
4 / -1

In a hydrogen atom, an electron moves in a circular orbit of radius 5.2 × 10^–11 m and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given μ₀ = 4π × 10^–7 Wb/A–m)

A
6.53 × 10^–3 ampere

B
13.25 × 10^–10 ampere

C
9.6 × 10⁶ ampere

D
1.04 × 10^–3 ampere

Solution