Question

A cell of emf E internal resistance r is connected to two external resistances R1 R2 a perfect ammeter. The current in the circuit ismeasured in four different situations-

1)without any external resistance inthe circuit.

2)with resistance R1 only.

3)withR1 R2 in series combination.

4)with R1 R2 inparallel combination.

The currents measured in the four cases are 0.42 A,1.05A,1.40A 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.

Answer 1

Since for the 1 case resistance is min so current will be maximum that is 4.2A
for 3 case resistance will be max so i will be min 0.42A. in parallerl resistance is less than individual resistances so resistance in case 4 is less than 2