Q78 / 90 · JEE Main 2023 (13 Apr Shift 2) · Physics

An electron is moving along the positive x-axis. If uniform magnetic field is applied parallel to the negative z-axis, then

A.The electron will experience magnetic force along positive y-axis

B.The electron will experience magnetic force along negative y-axis

C.The electron will not experience any force in magnetic field

D.The electron will continue to move along the positive x-axis

E.The electron will move along circular path in magnetic field

Choose the correct answer from the option given below:

  • A

    A and E only

  • B

    C and D only

  • Correct answer
    C

    B and E only

  • D

    B and D only

Solution

The Lorentz force is given by

F→=qv→×B→

=-ev→×B→

So, F^=i^×k^=-j^.

F→ is  along -y axis 

As the magnetic field is perpendicular to the velocity, motion would be circular.

Hence, the correct answer is option: 'C'.

Relevant Questions