A charged particle moves undeflected in a region of crossed electric and magnetic fields. If the electric field is switched off, the particle has an initial acceleration `a`. If the magnetic field is switched off, instead of electric field, the particle will have an initial acceleration

Options

A. equal to `0`
B. `gt a`
C. equal to `a`
D. `lt a`

Answer

C

Explanation

Since particle is moving in straight line
`F_(e) = F_(m)`
`F_(m) = ma = F_(e)`