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Question:

The figure shows a region of length ‘ $l$ ‘ with a uniform magnetic field of $0.3 \mathrm{~T}$ in it and a proton entering the region with velocity $4 \times 10^{5} \mathrm{~ms}^{-1}$ making an angle $60^{\circ}$ with the field. If the proton completes 10 revolution by the time it cross the region shown, ‘ $l$ ‘ is close to (mass of proton $=1.67 \times 10^{-27} \mathrm{~kg}$, charge of the proton $=1.6 \times 10^{-19} \mathrm{C}$ )

1. $0.11 \mathrm{~m}$

2. $0.88 \mathrm{~m}$

3. $0.44 \mathrm{~m}$

4. $0.22 \mathrm{~m}$

Correct Option: 3

JEE Main Previous Year 1 Question of JEE Main from Physics Moving Charges and Magnetism chapter.
JEE Main Previous Year Sep. 02, 2020 (II)

Solution:

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