Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 44

Score
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Weekly Quiz Competition

Question 1
4 / -1

A
NAIB

B
2NAIB

C
2πNAIB

D
4πNAIB

Solution
Question 2
4 / -1

A small coil of N turns has area A and a current I flows through it. The magnetic dipole moment of this coil will be

A
NI / A

B
NI²A

C
N²AI

D
NIA

Solution
Question 3
4 / -1

Two long parallel conductors carry currents in opposite directions as shown. One conductor carries a current of 10 A and the distance between the wires is d = 10 cm. Current I is adjusted so that the magnetic field at P is at a distance of 5 cm to the right of the 10A current. Value of i is

A
40 A

B
30 A

C
20 A

D
10 A

Solution
Question 4
4 / -1

A rectangular loop carrying a current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by

A

B

C

D
Question 5
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

C
πr²ev

D
2πrev

Solution
Question 6
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 7
4 / -1

A current carrying rectangular coil is placed in a uniform magnetic field. In which orientation, the coil will not tend to rotate

A
The magnetic field is parallel to the plane of the coil

B
The magnetic field is perpendicular to the plane of the coil

C
The magnetic field is at 45° with the plane of the coil

D
Always in any orientation
Question 8
4 / -1

A current carrying circular loop is freely suspended by a long thread. The plane of the loop will point in the direction

A
Wherever left free

B
North-south

C
East-west

D
At 45° with the East-West direction

Solution
Question 9
4 / -1

A current carrying loop is free to turn in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at

A
0° to the direction of the field

B
45° to the direction of the field

C
90° to the direction of the field

D
135° to the direction of the field

Solution
Question 10
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