Two batteries of emfs 12V and 6V and intenal resistance `0.2Omega` and `0.1Omega`, respectively are connected in opposition through a resistor `3.7Omega`. Calculate the terminal voltage of the first battery following either path.

Two batteries of emfs 2 V and 1 V of internal resistances 1Omega and 2Omega respectively are connected in parallel. The effective emf of the combination is

A battery of emf 2V and internal resistance 0.5(Omega) is connected across a resistance in 1 second?

A cell of emf 2V produces 0.3A current when connected to a resistor of 5Omega . Calculate the terminal voltage and internal resistance of the cell.

The series combination of two batteries both of the same emf 10 V, but different internal resistance of 20 Omega and 5Omega is connected to the parallel combination of two resistors 30Omega and R Omega . The voltage difference across the battery of internal resistance 20 Omega is zero, the value of R(in Omega ) is __________.