Alternating Current

The a.c. source is connected to series LCR circuit. If voltage across \(R\) is \(40 \mathrm{~V}\), that across \(\mathrm{L}\) is \(80 \mathrm{~V}\) and that across \(\mathrm{C}\) is \(40 \mathrm{~V}\), then the e.m.f. '\(e\)' of a.c. source is