Verified Solution • 2025–26 Session moderate

QJEEM19Ph4ad5: JEE Main 2019 Physics - Class 12 JEEM19Ph4ad5 Solution: A proton, an electron, and a Helium nucleus, have the same…

A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbits in a plane due to magnetic field perpendicualr to the plane. Let rp, re and rHe be their respective radii, then

Multiple Choice Options

  • A re < rp < rHe
  • B re < rp = rHe
  • C re > rp > rHe
  • D re > rp = rHe

Step-by-Step Verified Solution

r=mvqB=2mKqBr = {{mv} \over {qB}} = {{\sqrt {2mK} } \over {qB}}

{r_{He}} = {r_p} &gt; {r_e}

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