JEE Main20257 Apr 2025Morning ShiftPhysicsMagnetic Effects of CurrentActual
A particle of charge q , mass m and kinetic energy E enters in magnetic field perpendicular to its velocity and undergoes a circular arc of radius( r). Which of the following curves represents the variation of r with E ?
Correct answer
3
Step-by-step solution
mv ^2 r = qvB mv = qBr E = 1 2 mv ^2 E = 1 2 ~m ( q ^2 ~B ^2 r^2 ~m ^2 )= q ^2 ~B ^2 r ^2 2 ~m E = ( q ^2 ~B ^2 2 ~m ) r ^2 r^2 E