Question

In an experiment on measurements of emf of a cell by a potentiometer, the balancing length for a cell of emf E and internal resistance r is found to be l. Now if another cell of emf E and internal resistance 2r is connected in parallel to the first cell and balancing length determined, then the balancing length will be-

• A. l
• B. 2 l
• C. $\frac{\mathcal{l}}{2}$
• D. $\frac{2}{3}\mathcal{l}$

Answer 1

Answer: (A)

l

Answer 2

balancing length = l

E_net = E ⇒ balancing length = l