Published by:
CGP EDU Academic Team
Published on: September 13, 2026
An electron gun is placed inside a long solenoid of radius 
on its axis. The solenoid has 
turns/length and carries a current 
. The electron gun shoots an electron along the radius of the solenoid with speed 
. If the electron does not hit the surface of the solenoid, maximum possible value of 
is (all symbols have their standard meaning)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
JEE Main 2020
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