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QJEEM20Phba75: JEE Main 2020 Physics - Class 12 JEEM20Phba75 Solution: An electron gun is placed inside a long solenoid of radius R on …

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) : JEE Main 2020 (Online) 9th January Evening Slot Physics - Magnetic Effect of Current Question 139 English

Multiple Choice Options

  • A eμ0nIR4m
  • B eμ0nIRm
  • C eμ0nIR2m
  • D 2eμ0nIRm

Step-by-Step Verified Solution

B = μ0nI

mVmaxqB=R2

Vmax = qBR2m

= qRμ0nI2m

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