Problem

A cell of emf

3.4\,\text{V}

and internal resistance

3\tau

is connected to an ammeter having resistance

2\tau

and to an external resistance of

100\tau

. When a voltmeter is connected across the

100\tau

resistance, the ammeter reading is

0.04\,\text{A}

. Find the voltage reading by the voltmeter and its resistance. Had the voltmeter been an ideal one what would have been its reading?