Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 73

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Question 1
4 / -1

A charged particle is moving in a magnetic field of strength B perpendicular to the direction of the field. if q and m denote the charge and mass of the particle respectively, then the frequency of rotation of the particle is

A

B

C

D

Solution
Question 2
4 / -1

A charge particle of mass m and charge q enters a region of uniform magnetic field B perpendicular of its velocity v. The particle initially at rest was accelerated by a potential difference V (volts) before it entered the region of magnetic field. What is the diameter of the circular path followed by the charged particle in the region of magnetic field ?

A

B

C

D

Solution
Question 3
4 / -1

An electron having mass (9.1 × 10^-31 kg) and charge (1.6 × 10^-19 C) moves in a circular path of radius 0.5 m with a velocity 106 m s ^-1 in

A
1.13 × 10^-5 T

B
5.6 × 10^-6 T

C
2.8 × 10^-6 T

D
None of these

Solution
Question 4
4 / -1

A thin flexible wire of length L is connected to two adjacent fixed points and carries a current I in the clockwise direction, as shown in the figure. When the system is put in a uniform magnetic field of strength B going into the plane of the paper, the wire takes the shape of a circle. The tension in the wire is

A

B

C

D

Solution
Question 5
4 / -1

An electron is moving in an orbit of radius R with a time period T as shown in the figure. The magnetic moment produced may be given by

A

B

C

D

Solution
Question 6
4 / -1

The resultant force on the current loop PQRS due to a long current carrying conductor will be

A
10^-4 N

B
3.6 × 10^-4 N

C
1.8 × 10^-4 N

D
5 × 10^-4 N

Solution
Question 7
4 / -1

Three long, straight parallel wires, carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is

A
10^-3 N

B
2.5 × 10^-3 N

C
zero

D
1.5 × 10^-3

Solution
Question 8
4 / -1

The figure shows three situations when an electron with velocity v travels through a uniform magnetic field B. In each case, what is the direction of magnetic force on the electron?

A
+ ve z – axis, – ve x – axis, + ve y – axis

B
– ve z-axis, – ve x – axis and zero

C
+ ve z – axis, + ve y – axis and zero

D
– ve z – axis, + ve y – axis and zero
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

A and B are two conductors carrying a current I in the same direction, x and y are two electron beams moving in the same direction.

A
There will be attraction between A and B and also x and y.

B
There will be repulsion between A and B and also x and y

C
There will be attraction between A and B, repulsion between x and y

D
There will be repulsion between A and B, attraction between x and y