Physics · Magnetic Effects of Current
An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns per unit length and carries a current I. The electron gun shoots an electron radially outward from the axis with speed v. If the electron does not hit the inner surface of the solenoid, the maximum possible value of v is (where e is electron charge and m is electron mass):
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12eμ0nIRm
- 2eμ0nIR4m
- 3eμ0nIR2m✓
- 4eμ0nIRm
Correct answer
eμ0nIR2m
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