Question

A particle is projected in a plane perpendicular to a uniform magnetic field. The area bounded by the path described by the particle is proportional to
A. the velocity
B. the momentum
C. the kinetic energy
D. none of these

Answer 1

Correct Answer - C
Area of sector of circle `A = (1)/(2)r^(2) theta`
`A prop r^(2)`
`r = (sqrt(2mK))/(Bq), r prop sqrt(K), A prop K`