An electron with energy 0.1 keV moves at |EMF| JEE-MAIN 2022

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JEE MAIN 2022

25-07-2022 S2

Question

An electron with energy 0.1 keV moves at right angle to the earth's magnetic field of $1 \times 10^{-4} \mathrm{Wbm}^{-2}$. The frequency of revolution of the electron will be (Take mass of electron $=9.0 \times 10^{-31} \mathrm{kq}$ )

Select the correct option:

A

$1.6 \times 10^5 \mathrm{~Hz}$

B

$5.6 \times 10^5 \mathrm{~Hz}$

C

$2.8 \times 10^6 \mathrm{~Hz}$

D

$1.8 \times 10^6 \mathrm{~Hz}$

✓ Correct! Well done.

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