Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 31

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Weekly Quiz Competition

Question 1
4 / -1

A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. It is suspended in mid-air by a uniform horizontal magnetic field B. The magnitude of B (in tesla) is (assume g = 9.9 ms^–2)

A
2

B
1.5

C
0.55

D
0.66

Solution
Question 2
4 / -1

A circular loop of radius 0.0157 m carries a current of 2.0 amp. The magnetic field at the centre of the loop is
(μ₀ = 4π × 10^–7 weber/amp-m)

A
1.57 × 10^–5 weber/m²

B
8.0 × 10^–7 weber/m²

C
2.5 × 10^–7 weber/m²

D
3.14 × 10^–7 weber/m²

Solution
Question 3
4 / -1

A long solenoid has 200 turns per cm and carries a current of 2.5 amp. The magnetic field at its centre is (μ₀ = 4π × 10^–7 weber/amp-m)

A
3.14 × 10^–2 weber/m²

B
6.28 × 10^–2 weber/m²

C
9.42 × 10^–2 weber/m²

D
12.56 × 10^–2 weber/m²

Solution
Question 4
4 / -1

Two concentric coplanar circular loops of radii r₁ and r₂ carry currents of respectively i₁ and i₂ in opposite directions (one clockwise and the other anticlockwise). The magnetic induction at the centre of the loops is half that due to i₁ alone at the centre. If r₂ = 2r₁. The value of i₂ / i₁ is

A
2

B
1/2

C
1/4

D
1

Solution
Question 5
4 / -1

PQRS is a square loop made of uniform conducting wire. If the current enters the loop at P and leaves at S, then the magnetic field will be

A
Maximum at the centre of the loop

B
Zero at the centre of loop

C
Zero at all points inside the loop

D
Zero at all points outside of the loop
Question 6
4 / -1

Magnetic fields at two points on the axis of the circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8 : 1. The radius of the coil is

A
1.0 m

B
0.1 m

C
0.15 m

D
0.2 m

Solution
Question 7
4 / -1

The dimension of the magnetic field intensity B is

A
[MLT^–2A^–1]

B
[MT^–2A^–1]

C
[ML²TA^–2]

D
[M²LT^–2A^–1]

Solution
Question 8
4 / -1

A current of 2 amp. flows in a long, straight wire of radius 2 mm. The intensity of magnetic field on the axis of the wire is

A

B

C

D
Zero
Question 9
4 / -1

The magnetic field at the centre of a circular coil of radius r carrying current I is B₁. The field at the centre of another coil of radius 2r carrying same current I is B₂. The ratio B₁ / B₂ is

A
1/2

B
1

C
2

D
4

Solution
Question 10
4 / -1

What should be the current in a circular coil of radius 5 cm to annul B_H = 5 × 10^–5 T

A
0.4 A

B
4 A

C
40 A

D
1 A

Solution