An accumulator of emf and negligible internal resistance is connected across a…
PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
An accumulator of emf 2V and negligible internal resistance is connected across a uniform wire of length 10m and resistance 30Ω. The appropriate terminals of a cell of emf 1.5V and internal resistance 1Ω are connected to one end of the wire, and the other terminal of the cell is connected through a sensitive galvanometer to a slider on the wire. What length of wire produces zero deflection of the galvanometer? How does the balancing length change in the following cases?
(a) When a coil of resistance 5Ω is placed in series with the accumulator.
(b) When the 1.5V cell is shunted with a 5Ω resistor.