Question

A point charge +q kept in a electric field E experience a force $F_E$ at a particular location. If at the same location a point charge -2q is kept, then electric force on the -2q charge is :

• A. $\frac{-F_E}{2}$
• B. $-2F_E$
• C. $-2q{F}_E$
• D. $\frac{-2F_E}{q}$
• E. $\frac{-F_E}{\left(2q\right)}$

Answer 1

The correct option is B $-2F_E$

Force experienced by the charged particle placed in an electric field $F=QE$

where $Q$ is the charge of particle.

For charge $+q$ : $F_E=qE$

For charge $-2q$ : $F_E^{\prime }=-2qE=-2F_E$