Q. Three voltmeters are connected as shown. A potential difference has been applied between A and B. On closing the switch S , readings of voltmeters ?
(a) V1 increases
(b) V1 decreases
(c) V2 and V3 both increase
(d) One of V2 and V3 increases and other decreases.
Sol: Initially , when switch is open V2 & V3 are out of the circuit means no P.D across it.
When switch is closed , all the voltmeters are in parallel , hence there is some P.D across V2 & V3 .
Hence increases .