In a series circuit, three resistors R1, R2 and R3 are connected to an ideal battery of emf V. Which of the following gives the potential difference V2 across R2?
a) V2=R1+R2+R3R1+R2V
b) V2=R2R1+R2+R3V
c) V2=R1+R2+R3R2V
d) V2=R1+R3R2V