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JEE Main 202313 AprilEvening Shift
Exam
JEE Main
Year
2023
Date
13 April
Shift
Evening Shift
Subject
Physics
Chapter
Magnetic Effects of Current

JEE Main 2023 · 13 April · Evening Shift · Physics · Magnetic Effects of Current

An electron is moving along the positive x-axis. If uniform...

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:

Options

  1. A

    A and E only

  2. B

    C and D only

  3. C

    B and E only

  4. D

    B and D only

Correct answer

C.

B and E only

Step-by-step solution

The Lorentz force is given by

F→=qv→×B→\overset{\to}{F} = q\overset{\to}{v} \times \overset{\to}{B}

=−ev→×B→= - e\overset{\to}{v} \times \overset{\to}{B}

So, \overset{^}{F} = \overset{^}{i} \times \overset{^}{k} = - \overset{^}{j}.

F→isalong−yaxis\overset{\to}{F}is\text{along} - y\text{axis}

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

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