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JEE Main 9 Jan 2020 Shift 2 Solved Paper

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Question : 2

Total: 75

An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed v. If the electron does not hit the surface of the solenoid, maximum possible value of v is (all symbols have their standard meaning) :

eµ0nIR
m
eµ0nIR
2m
2eµ0nIR
m
eµ0nIR
4m

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