Physics · Moving Charges and Magnetic Field

JEE Main 2024 — 4 April, Shift 1 — Question 31

An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :

Option A:
the electron will be accelerated along the axis.
Option B:
the electron will continue to move with uniform velocity along the axis of the solenoid.
Correct
Option C:
the electron path will be circular about the axis.
Option D:
the electron will experience a force at $45^{\circ}$ to the axis and execute a helical path.

Answer: B

Step-by-step solution

Since $\vec{v} \| \vec{B}$ so force on electron due to magnetic field is zero. So it will move along axis with uniform velocity.

Solution figure

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 4 April, Shift 1
Subject: Physics
Chapter: Moving Charges and Magnetic Field
Topic: Motion of Charged Particles in magnetic Fields

The magnetic field existing in a region is given by vecB=0.2(1+2 x) hatk T . A square loop of edge 50 cm carrying 0.5 A current is placed…

An electron is projected with uniform velocity along the axis inside… | JEE Main 2024 PYQ with Solution · DhiX AI