What is the equivalent capacitance, $C$, of the five capacitors, connected as shown in Figure?

A charge $‘q’$ is moved from a point A above a dipole of dipole moment $‘p’$ to a point $B$ below the dipole in equatorial plane without acceleration. Find the work done in the process.

A point charge $Q$ is placed at point $O$ as shown in the figure below. The potential difference $V_A-V_B$ positive. Is the charge $Q$ negative or positive?