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# Test: Motion In Combined E And B Fields

## 5 Questions MCQ Test Physics Class 12 | Test: Motion In Combined E And B Fields

Description
This mock test of Test: Motion In Combined E And B Fields for Class 12 helps you for every Class 12 entrance exam. This contains 5 Multiple Choice Questions for Class 12 Test: Motion In Combined E And B Fields (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Motion In Combined E And B Fields quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: Motion In Combined E And B Fields exercise for a better result in the exam. You can find other Test: Motion In Combined E And B Fields extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

### Time taken by an ion to describe a semicircular path, in a cyclotron

Solution:

We also know for a circular motion time period = 2πm/qb as the charge in question has. Constant q, mass is also constant, b is also constant thus time period for semicircular path is constant.

QUESTION: 3

### If a charged particle goes undeflected in a region containing electric and magnetic fields. Select all of the following statements that must be true for this. 1. must be perpendicular to 2. must be perpendicular to 3. must be perpendicular to 4.  E must be equal to vB​

Solution:

If a charged particle goes unaccelerated in a region containing
electric and magnetic fields, QUESTION: 4

The dipole moment of a current loop is independent of:

Solution:
QUESTION: 5

If cathode rays are projected at right angles to a magnetic field, their trajectory is

Solution:

The magnetic force acts perpendicular to the velocity of the particle. This  causes circular motion. In the magnetic field the speed and kinetic energy of the particle remain constant, but the direction is altered at each instant by the perpendicular magnetic force.