An RC flash-charging circuit is designed to have a time constant of

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

3.0\,\text{s}

. If the charging resistor has a resistance of

1.2\,\text{M}\Omega

, what is the required capacitance? (a)

3.6\,\mu\text{F}

(b)

0.28\,\mu\text{F}

(c)

2.5\,\mu\text{F}

(d)

2.5\,\text{nF}