A Spaceship Encounters a Single Plane of Charged Particles,with the Charge

Multiple Choice

A spaceship encounters a single plane of charged particles,with the charge per unit area equal to $\sigma$ .The electric field a short distance above the plane has magnitude ____ and is directed ____ to the plane.

A) $\frac { \sigma } { 2 \varepsilon _ { 0 } }$ ,parallel
B) $\frac { \sigma } { 2 \varepsilon _ { 0 } }$ ,perpendicular
C) $\frac { \sigma } { \varepsilon _ { 0 } }$ ,parallel
D) $\frac { \sigma } { \varepsilon _ { 0 } }$ ,perpendicular
E) $\frac { 2 \sigma } { \varepsilon _ { 0 } }$ ,parallel