Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 68

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Weekly Quiz Competition

Question 1
4 / -1

A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber/m². The magnetic dipole moment of the coil is

A
0.15 ampere-m²

B
0.3 ampere-m²

C
0.45 ampere-m²

D
0.6 ampere-m²

Solution
Question 2
4 / -1

A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segment PS, SR and RQ are F₁, F₂ and F₃ respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is

A

B

C

D

Solution
Question 3
4 / -1

If two streams of protons move parallel to each other in the same direction, then they

A
Do not exert any force on each other

B
Repel each other

C
Attract each other

D
Get rotated to be perpendicular to each other
Question 4
4 / -1

Two parallel wires carrying currents in the same direction attract each other because of

A
Potential difference between them

B
Mutual inductance between them

C
Electric force between them

D
Magnetic force between them
Question 5
4 / -1

Two straight parallel wires, both carrying 10 ampere in the same direction attract each other with a force of 1 × 10^–3 N. If both currents are doubled, the force of attraction will be

A
1 × 10^–3 N

B
2 × 10^–3 N

C
4 × 10^–3 N

D
0.25 × 10^–3 N

Solution
Question 6
4 / -1

A small circular flexible loop of wire of radius r carries a current I. It is placed in a uniform magnetic field B. The tension in the loop will be doubled if

A
I is doubled

B
B is halved

C
r is doubled

D
Both B and I are doubled

Solution
Question 7
4 / -1

The deflection in a moving coil galvanometer is

A
Directly proportional to the torsional constant

B
Directly proportional to the number of turns in the coil

C
Inversely proportional to the area of the coil

D
Inversely proportional to the current flowing

Solution
Question 8
4 / -1

In a moving coil galvanometer, the deflection of the coil θ is related to the electrical current i by the relation

A

B

C

D

Solution
Question 9
4 / -1

The unit of electric current \"ampere\" is the current which when flowing through each of two parallel wires spaced 1 m apart in vaccum and of infinite length will give rise to a force between them equal to

A
1 N/m

B
2 × 10^–7 N/m

C
1 × 10^–2 N/m

D
4π × 10^–7 N/m

Solution
Question 10
4 / -1

An electron moves with a constant speed v along a circle of radius r. Its magnetic moment will be (e is the electron\'s charge)

A
evr

B
1/2 evr

C
πr²ev

D
2πrev

Solution