Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 48

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Weekly Quiz Competition

Question 1
4 / -1

A, B and C are parallel conductors of equal length carrying currents I, I and 2I respectively. Distance between A and B is x. Distance between B and C is also x. F₁ is the force exerted by B on A and F₂ is the force exerted by C on A. Choose the correct answer

A
F₁ = 2 F₂

B
F₂ = 2F₁

C
F₁ = F₂

D
F₁ = –F₂

Solution
Question 2
4 / -1

A straight conductor carries a current of 5 A. An electron travelling with a speed of 5 × 10⁶ ms^–1 parallel to the wire at a distance of 0.1 m from the conductor, experience a force of

A
8 × 10^–20 N

B
3.2 × 10^–19 N

C
8 × 10^–18 N

D
1.6 × 10^–19 N

Solution
Question 3
4 / -1

Two galvanometers A and B require 3 mA and 5 mA respectively to produce the same deflection of 10 divisions. Then

A
A is more sensitive than B

B
B is more sensitive than A

C
A and B are equally sensitive

D
Sensitiveness of B is 5/3 times that of A

Solution
Question 4
4 / -1

A beam of electrons and protons move parallel to each other in the same direction, then they

A
Attract each other

B
Repel each other

C
No relation

D
Neither attract nor repel
Question 5
4 / -1

If the current is doubled, the deflection is also doubled in

A
A tangent galvanometer

B
A moving coil galvanometer

C
Both (a) and (b)

D
None of the above

Solution
Question 6
4 / -1

Two long conductors, separated by a distance d carry current I₁ and I₂ in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to 3d. The new value of the force between them is

A
–2F

B
F/3

C
2F/3

D
–F/3

Solution
Question 7
4 / -1

The resultant magnetic moment of neon atom will be

A
Infinity

B
μ_B

C
Zero

D
μ_B/2
Question 8
4 / -1

A one metre long wire is lying at right angles to the magnetic field. A force of 1 kg wt. is acting on it in a magnetic field of 0.98 tesla. The current flowing in it will be

A
100 A

B
10 A

C
1 A

D
Zero

Solution
Question 9
4 / -1

The magnetic field on the axis of a long solenoid having n turns per unit length and carrying a current is

A
μ₀ni

B
μ_Bn²i

C
μ_Bni²

D
None of these

Solution
Question 10
4 / -1

The ratio of magnetic field and magnetic moment at the centre of a current carrying circular loop is x. When both the current and radius is doubled then the ratio will be

A

B

C

D

Solution