if a charged particle projected in a gravity free room deflects,

Options

A. Electric field must be present
B. Magnetic field must be present.
C. Both, the electric field and the magnetic field, can not be zero.
D. The electric and magnetic field, both, may be nonzero.

Answer

c, d

Explanation

Deflection means that there is some electromagnetic force. Both may or may not be there, but at least one must be there because a particle can be deflected from both the fields. Hence options (c) and (d) are correct.