Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 36

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Weekly Quiz Competition

Question 1
4 / -1

The magnetic force on a charged particle moving in the field does not work, because

A
Kinetic energy of the charged particle does not change

B
The charge of the particle remains same

C
The magnetic force is parallel to velocity of the particle

D
The magnetic force is parallel to magnetic field

Solution
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

Which of the following statements is true

A
The presence of a large magnetic flux through a coil maintains a current in the coil if the circuit is continuous

B
A coil of a metal wire kept stationary in a non-uniform magnetic field has an e.m.f. induced in it

C
A charged particle enters a region of uniform magnetic field at an angle of 85° to the magnetic lines of force; the path of the particle is a circle

D
There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it
Question 4
4 / -1

An electron and a proton enter region of uniform magnetic field in a direction at right angles to the field with the same kinetic energy. They describe circular paths of radius r_e and r_p respectively. Then

A
r_e = r_p

B
r_e< r_p

C
r_e> r_p

D
r_e may be less than or greater than r_p depending on the direction of the magnetic field

Solution
Question 5
4 / -1

A proton of mass 1.67 × 10^–27 kg and charge 1.6 × 10^–19C is projected with a speed of 2 × 10⁶ m/s at an angle of 60° to the X–axis. If a uniform magnetic field of 0.104 tesla is applied along Y-axis, the path of the proton is

A
A circle of radius = 0.2 m and time period π × 10^–7s

B
A circle of radius = 0.1 m and time period 2π × 10^–7s

C
A helix of radius = 0.1 m and time period 2π × 10^–7s

D
A helix of radius = 0.2 m and time period 4π × 10^–7s

Solution
Question 6
4 / -1

A proton and a deutron both having the same kinetic energy, enter perpendicular into a uniform magnetic field B. For motion of proton and deutron on circular path of radius R_p and R_d respectively, the correct statement is

A

B

C

D

Solution
Question 7
4 / -1

A proton and an electron both moving with the same velocity v enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that

A
Their time periods will be same

B
The time period for proton will be higher

C
The time period for electron will be higher

D
Their orbital radii will be same

Solution
Question 8
4 / -1

A charge +Q is moving upwards vertically. It enters a magnetic field directed to the north. The force on the charge will be towards

A
North

B
South

C
East

D
West
Question 9
4 / -1

A beam of well collimated cathode rays travelling with a speed of 5 × 10⁶ ms^–1 enter a region of mutually perpendicular electric and magnetic fields and emerge undeviated from this region. If |B|= 0.02 T, the magnitude of the electric field is

A
10⁵ Vm^–1

B
2.5 × 10⁸ Vm^–1

C
1.25 × 10¹⁰ Vm^–1

D
2 × 10³ Vm^–1

Solution
Question 10
4 / -1

An electron is moving in the north direction. It experiences a force in vertically upward direction. The magnetic field at the position of the electron is in the direction of

A
East

B
West

C
North

D
South