Observe the circuit and answer the questions given below.
i) Are resistors 3 and 4 in series ?
ii) Are resistors 1 and 2 in series ?
iii) Is the battery in series with any resistor ?
iv) What is the potential drop across the resistor 3 ?
v) What is total emf in the circuit if the potential drop across resistor 1 is 6V?