Eight cells marked 1 to 8, each of emf `5 V` and internal resistance `0.2 Omega` are connected as shown. What is the reading of ideal voltmeter ?

Six cells each of e.m.f. 2 V and internal resistance 0.1Omega are connected to three resistances as shown in figure. The reading of a low resistance ammeter A in the circuit is,

in the circuit shown in the figure, each battery is of 5 V and has an internal resistance of 0.2 Omega What is the reading of the ideal voltmeter V