Question

In
series combination of two resistors if the potential difference across the ends of resistor A is 5 V and the potential difference across the
resistor B is 7 V, then the battery
connected to the circuit will be of the following
a)5 V
(b) 7 V
c) 12 V
d) 2 V​

Answer 1

Answer:

(c) 12 V

Explanation:

When current flows through through all the resistances and is returning to the battery, the Voltage becomes 0.

i.e. The total potential drop is the volage of the battery

⇒ (V - 5) - 7 = 0

⇒ V - 12 = 0

∴ V = 12 V

Thanks !