Test: Magnetic Lorentz Force - NEET MCQ

# Test: Magnetic Lorentz Force - NEET MCQ

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## 10 Questions MCQ Test Physics Class 12 - Test: Magnetic Lorentz Force

Test: Magnetic Lorentz Force for NEET 2024 is part of Physics Class 12 preparation. The Test: Magnetic Lorentz Force questions and answers have been prepared according to the NEET exam syllabus.The Test: Magnetic Lorentz Force MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Magnetic Lorentz Force below.
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Test: Magnetic Lorentz Force - Question 1

### An electron with a speed of 1.8 x 106 m/s is moving in a circular orbit in a uniform magnetic field of 10-4 Wb/m², the radius of the circular path of the electron is​

Detailed Solution for Test: Magnetic Lorentz Force - Question 1

4. 0.1063 m

Test: Magnetic Lorentz Force - Question 2

### A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction

Detailed Solution for Test: Magnetic Lorentz Force - Question 2

As the electron is moving along the direction of the magnetic field, it will experience no magnetic force, but due to an electric force acting on it opposite to the direction of electric field (as it is a negatively charged particle) the velocity of the electron will decreases.

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Test: Magnetic Lorentz Force - Question 3

### The force acting on a charge q moving with velocityin a magnetic field is given by

Detailed Solution for Test: Magnetic Lorentz Force - Question 3

The magnetic force on a free moving charge is perpendicular to both the velocity of the charge and the magnetic field with direction given by the right hand rule . The force is given by the charge times the vector product of velocity and magnetic field.

Test: Magnetic Lorentz Force - Question 4

A Charge is fired through a magnetic field. The magnetic force acting on it is maximum when the angle between the direction of motion and magnetic field is

Detailed Solution for Test: Magnetic Lorentz Force - Question 4

The force will have a magnitude F=qvB sin q, thus it will be maximum if sin q is maximum. Thus, angle between velocity and magnetic field should be 90o or the charge particle moves perpendicular to the velocity vector.

Test: Magnetic Lorentz Force - Question 5

The frequency (v) of charged particle, moving at right angles to the magnetic field is independent of

Detailed Solution for Test: Magnetic Lorentz Force - Question 5

Frequency (v) = qB/2πm.
Frequency is independent of radius of trajectory of particle and speed of particle.

Test: Magnetic Lorentz Force - Question 6

Find the magnetic force when a charge 3.5C with flux density of 4 units is having a velocity of 2m/s.

Detailed Solution for Test: Magnetic Lorentz Force - Question 6

The magnetic force is given by F = q(v x B), where q = 3.5C, v = 2m/s and B = 4 units. Thus we get F = 3.5(2 * 4) = 28 units.

Test: Magnetic Lorentz Force - Question 7

A proton enters a magnetic field with a velocity of 1.5 x 105 m/s making an angle of 30° with the field. What is the force experienced by the proton if B = 3.0 T.​

Detailed Solution for Test: Magnetic Lorentz Force - Question 7

Test: Magnetic Lorentz Force - Question 8

When a charged particle moves in a magnetic field, its kinetic energy always

Detailed Solution for Test: Magnetic Lorentz Force - Question 8

When a charged particle enters a magnetic field B its kinetic energy remains constant as the force exerted on the particle is:

is perpendicular to so the work done by =0. This does not cause any change in kinetic energy.

Test: Magnetic Lorentz Force - Question 9

A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in the uniform magnetic field. What should be the energy of an alpha particle to describe a circle of the same radius in the same field.

Detailed Solution for Test: Magnetic Lorentz Force - Question 9

Kinetic energy of a charged particle,

Radius of the circular path of a charged particle uniform magnetic field is given by

Mass of a proton, mp = m

Mass of an α-particle. mα = 4m

Charge of a proton, qp = e

Charge of an α -particle, qα = 2e

Test: Magnetic Lorentz Force - Question 10

An electron is moving in a circular orbit in a magnetic field 2 x 10-3 Wb/m², the time period of electron is

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## Physics Class 12

105 videos|425 docs|114 tests