Answer: 1.275 V.
- A 0.82 V
- B 1.02 V
- C 1.275 V
- D 2.04 V
Correct answer: C. 1.275 V
Explanation: EMF is proportional to balance length. E<sub>2</sub>/E<sub>1</sub> = l2/l1. E<sub>2</sub> = 1.02 x 50/40 = 1.275 V.
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.