Electric Fields Practice Test

A fixed source charge $+Q$ creates an electric field. A test charge is placed at point $P$ a distance $r$ from $+Q$, then replaced by a test charge of twice the magnitude at the same point. Which statement best describes the electric field at point $P$ after the replacement?

Two fixed source charges, $+Q$ and $-Q$, are separated by a distance $2d$. A test charge is placed at the midpoint between them. Which statement best describes the direction of the electric field at the midpoint?