English: that means and then open circuit voltage, I mean voltage across the capacitor that v_(c) ∞ , that is v_(c) ∞ this is the this is voltage v_(c) ∞ this is the voltage = this 20 into this 1 by 4 ampere, that = 5 volt , because, capacitor is open circuit at that time.
Telugu: ఈ వోల్టేజ్ v_(C)(∞) = 20 * 1/4 ఆంపియర్ = 5 వోల్ట్, ఎందుకంటే, కెపాసిటర్ ఆ సమయంలో ఓపెన్ సర్క్యూట్.