3. Equivalent Batter}:r 1n the circuit shown, each of 3 batteries is represented as an ideal emf in series with its internal resistance r1 where r = 5- H. The}? are connected by a set of resistors with resistances as multiples cf H. 2 0.4 . 12V r O a R 10V b r O BR 2R 8V r(a) If an ideal voltmeter (with infinite internal resistance) is connected between points a and b, what is its reading? (b) If, instead, an ideal ammeter (with zero internal resistance) is connected between points a and b, what is its reading? (c) What would be the emf & and internal resistance r of a single battery circuit that would give the same two meter readings as in the original circuit? This is called the equivalent circuit because, for loads attached over a and b in the original circuit, this is the circuit the load 'sees