JEE Main 201910 Apr, Morning shiftPhysicsEasyMagnetic Effects of Current and Magnetism165× since 2002
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 r_p, r_e and r_He be
their respective radii, then