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Q#1 Transient Analysis GATE EE 2020 NAT +2 marks -0 marks

A resistor and a capacitor are connected in series to a 10 V DC supply through a switch. The switch is closed at t=0, and the capacitor voltage is found to cross 0V at t=0.4τ, where τ is the circuit time constant. The absolute value of percentage change required in the initial capacitor voltage if the zero crossing has to happen at t=0.2τ is_________ (rounded off to 2 decimal places).

Explanation:

If initial charge polarities on the capacitor is opposite to the supply voltage then only the capacitor voltage crosses the zero line.

Diagram, schematic

Description automatically generated

Vc(t)   Final value + (Initial value - Final value)

Now,

% change in voltage

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