A capacitor of capacitance stores a charge when connected to a source

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A capacitor of capacitance

5\,\mu\text{F}

stores a charge

Q

when connected to a

200\,\text{V}

source. If the capacitance is increased to

15\,\mu\text{F}

while the stored charge remains the same, what will be the new potential difference across the capacitor? Give your answer with brief reasoning.