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How does the current through a capacitor behave in a DC circuit when the circuit reaches a steady state?
Question

How does the current through a capacitor behave in a DC circuit when the circuit reaches a steady state?

A.

It becomes infinite

B.

It remains constant

C.

It becomes zero

D.

It oscillates continuously

Correct option is C

In a DC circuit, when the circuit reaches steady state: The capacitor becomes fully charged. The voltage across the capacitor becomes constant.Since capacitor current is given byiC=CdVdtand dVdt=0 at steady state,iC=0Thus, a capacitor behaves like an open circuit for DC in steady state.\text{In a DC circuit, when the circuit reaches steady state:} \\[8pt]\bullet \ \text{The capacitor becomes fully charged.} \\[4pt]\bullet \ \text{The voltage across the capacitor becomes constant.} \\[6pt]\text{Since capacitor current is given by} \\[6pt]i_C = C \frac{dV}{dt} \\[8pt]\text{and } \frac{dV}{dt} = 0 \text{ at steady state,} \\[8pt]i_C = 0 \\[10pt]\text{Thus, a capacitor behaves like an open circuit for DC in steady state.}​​

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