Question

when an initially uncharged capacitor in an RC circuit, what happens to the potential difference across the capacitor

Reading Question 27.23 When an initially uncharged capacitor is charged in an RC circuit, what happens to the potential difference across the resistor? O It is initially 0 and then increases linearly with time. O It is initially at its maximum value and then decreases linearly with time. O It is initially at its maximum value and then decreases exponentially with time. O It is initially 0 and then increases exponentially with time. O It is constant during the charging LINK TO TEXT

Answer 1

• It is initially at its maximum value and then decreases exponentially with time .

Explanation :

• Voltage across resistance in an RC circuit during charging varies as :

VR= E*et/
; E is emf of battery and $\tau$ is time constant of the circuit .

• So at t=0 , V = E and for later time it decreases exponentially .