A fully charged capacitor is allowed to discharge through a resistor (R )

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

Problem

A fully charged capacitor is allowed to discharge through a resistor

R

. After 0.10 s, the current has decreased to about 37 % of its initial value. The experiment is repeated after replacing the resistor with one of resistance

\tfrac{1}{2}R

, and the capacitor is recharged to the same initial charge before being discharged again. Which statement best describes the current 0.10 s after the second discharge begins? (a)

\displaystyle 37\%

of the new initial current (b)

\displaystyle 100\%

of the new initial current (essentially unchanged) (c)

\displaystyle 14\%

of the new initial current (d)

\displaystyle 63\%

of the new initial current

Related theory

Time-Dependent Circuits
Electric Circuits

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