If a charged particle goes unaccelerated in a region containing electric and magnetic fields,

Options

A. `vec(E)` must be parallel to `vec(B)`
B. `vec(V)` must be perpendicular to Electric field
C. `vec(V)` must be perpendicular to `vec(B)`
D. E must be equal to to vB

Answer

B

Explanation

`qvec(E)=-(vec(V)xxvec(B))`
`rArr vec(E)=-(vec(V)xxvec(B))`
`rArr vec(E) bot vec(V) and vec(E) bot vec(B)`