An electron is moving along... | EMF| JEE-MAIN 2020

JEE MAIN 2020

06.09.20_S1

Question

An electron is moving along $+x$ direction with a velocity of $6 \times 10^6 \mathrm{~ms}^{-1}$. It enters a region of uniform electric field of $300 \mathrm{~V} / \mathrm{cm}$ pointing along $+y$ direction. The magnitude and direction of the magnetic field set up in this region such that the electron keeps moving along the $x$ direction will be

Select the correct option:

$5 \times 10^{-3} \mathrm{~T}$, along +z direction

$5 \times 10^{-3} \mathrm{~T}$, along -z direction

$3 \times 10^{-4} \mathrm{~T}$, along +z direction

$3 \times 10^{-4} \mathrm{~T}$, along -z direction

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\begin{aligned} & F=q(\vec{E}+\vec{V} \times \vec{B}) \\ & \vec{E}+\vec{V} \times \vec{B}=0\end{aligned}$

Question Tags

JEE Main

Physics