Download App

Moving Charges and Magnetism — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
MCQ
Two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
Assertion (A): The kinetic energy of a charged particle moving in a uniform magnetic field does not change. Reason (R): In a uniform magnetic field no force acts on the charge particle.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is NOT the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false and R is also false.
✓

Answer

  1. A is true but R is false.

Explanation:

When a charged particle is moving in a uniform magnetic field, it experiences a force in a direction perpendicular to its direction of motion. Due to which the speed of the charged particle remains unchanged and hence its kinetic energy remains same.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q [1M]" from Moving Charges and Magnetism→Moving Charges and Magnetism — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor

(a)        

(b)  

(c)   

(d) 2
→
Coulomb's Law is true for:
→
A photon of energy hv is absorbed by o free electron of a metal having work function $\varphi<\text{hv}.$
  1. The electron is sure to come out.
  2. The electron is sure to come out with a kinetic energy $\text{hv}-\varphi.$
  3. Either the electron does not come out or it comes out with a kinetic energy $\text{hv}-\varphi$ .
  4. It may come out with a kinetic energy less than $\text{hv}-\varphi.$
→

In the given nuclear reaction, how many a and b particles are emitted  

(a) 3a  particles and 2b particle

(b) 4a particles and 3b particle

(c) 6a particles and 4b particle

(d) 7a particles and 4b particle
→
A nucleus of element X is represented as $^{56}_{26}\text{X}$
Which is an isotope of element X?
→
The two ends of a spring are displaced along the length of the spring. All displacement have equal magnitudes. In which case or cases the tension or compression in the spring will have a maximum magnitude?
  1. The right end is displaced towards right and the left end towards left.
  2. Both ends are displaced towards right.
  3. Both ends are displaced towards left.
  4. The right end is displaced towards left and the left end towards right.
→
SI unit of the magnetic field is _________.
→
The unit of specific resistance is:
→
The dielectric constant of water is :
→
If L is the coherent length and c the velocity of light, the coherent time is:
→