Question

Four identical 2.5 mF capacitors are connected together electrically. What is the greatest possible capacitance of the combination? 0.50 mF, 0.42 mF, 0.63 mF, 10 mF, or 0.40 mF?​

Answer 1

When capacitors are in PARALLEL, they add up. (like resistors in series)

If you connect these four capacitors in parallel, the combination behaves like a single capacitor of (4 x 2.5) = 10 mF.

That's the greatest capacitance you can make with these four pieces.