Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

A and B are two infinitely long straight parallel conductors. C is another straight conductor of length lm kept parallel to A and B as shown in the figure. Then the force experienced by C is

A
towards A equal to 0.6 × 10^-5 N

B
towards B equal to 5.4 × 10^-5 N

C
towards A equal to 5.4 × 10^-5 N

D
towards B equal to 0.6 × 10^-5 N

Solution
Question 2
4 / -1

A wire PQR is bent as shown in figure and is placed in a region of uniform magnetic field B. The length of PQ = QR = l. A current I ampere flows through the wire as shown. The magnitude of the force on PQ and QR will be

A
BIl, 0

B
2BIl,0

C
0, BIl

D
0, 0

Solution
Question 3
4 / -1

Two long conductors, separated by a distance d carry currents 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 direction is reversed. The distance is also increased to 3 d. The new value of the force between them is

A
-2F

B
F/3

C
-2F/3

D
-F/3

Solution
Question 4
4 / -1

Three long straight wires A, B and C are carrying currents as shown in figure. Then the resultant force on B is directed

A
perpendicular to the plane of paper and outward

B
perpendicular to the plane of paper and inward

C
towards A

D
towards B

Solution
Question 5
4 / -1

Two thin, long, parallel wires, separated by a distance d carry a current of i ampere in the same direction. They will

A

B

C

D

Solution
Question 6
4 / -1

A circular coil of 20 turns and radius 10 cm is placed in uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in coil is 5 A, then the torque acting on the coil will be

A
31.4 N–m

B
3.14 N–m

C
0.314 N–m

D
zero

Solution
Question 7
4 / -1

A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is

A
greater than at Q

B
same as at Q

C
less than at Q

D
greater or less than at, Q depending upon the strength of current.

Solution
Question 8
4 / -1

In the fig. shown the magnetic field induction at the centre O of the arc due to current in portion CD will be

A
μ₀I

B
μ₀I/2r

C
μ₀I/4r

D
zero
Question 9
4 / -1

In the fig. shown, there are two semicircles of radii r₁ and r₂ in which a current I is flowing. The magnetic field induction at the centre O will be

A

B

C

D

Solution
Question 10
4 / -1

A current I flows along the length of an infinity long straight thin walled pipe. Then

A
the magnetic field at all points inside the pipe is same but not zero

B
the magnetic field at any point inside the pipe is zero

C
the magnetic field is zero only on the axis of the pipe

D
the magnetic field is different at different point inside the pipe.

Solution