This is because, the symbol // means "parallel to" in geometry.
Parallel means when two line segments are corresponding with each other and they never meet. (beside one another)
The rest of the options don't make any sense. For example choice 2 states that FG is perpendicular to TU. Perpendicular would mean that the line creates a 90 degree angle when they intersect. So that's false, and the same goes for choice 3.
Choice 4 states that TU is parallel to FG, which is completely false because they both intersect.
The surface charge density: S(igma) = Q / A A = 1.6 * 10^(-2) * 1.6 * 10^(-2) = 2.56 * 10^(-4) m² The electric field: E = S / E(psilon) o E = 0.711 * 10^^(-9) / ( 2.56 * 10 ^(-4) * 8.85 * 10 ^(-12) ) = = 0.3138 * 10 ^6 = 3.138 * 10^5 V/m a ) Δ V = E d Δ V = 3.138 * 10^5 V/m* 1.2 * 10^(-3) m = 376.56 V b ) When d = 2.40 mm: Δ V = 3.138 * 10^5 V/m * 2.40 *10^(-3) m = 753.12 V
