Physics · 2020
JEE Main · 6 September 2020, Shift 1 · Q13
An electron is moving along +x direction with a velocity of 6 × 10^6 ms^-1. It enters a region of uniform electric field of 300 V / cm pointing along…
An electron is moving along $\displaystyle +x$ direction with a velocity of $\displaystyle 6 \times 10^6 \mathrm{~ms}^{-1}$. It enters a region of uniform electric field of $\displaystyle 300 \mathrm{~V} / \mathrm{cm}$ pointing along $\displaystyle +y$ direction. The magnitude and direction of the magnetic field set up in this region such that the electron keeps moving along the $\displaystyle x$ direction will be :
Official answer
(1)
$\displaystyle 5 \times 10^{-3} \mathrm{~T}$, along $\displaystyle +z$ direction
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.