Current Electricity and Electrical InstrumentMedium
Question
The diagram besides shows a circuit used in an experiment to determine the emf and internal resistance of the cell C. A graph was plotted of the potential difference V between the terminals of the cell against the current I, which was varied by adjusting the rheostat. The graph is shown on the right; x and y are the intercepts of the graph with the axes as shown. What is the internal resistance of the cell ?
Options
A.x
B.y
C.
D.
Solution
V = E - ir ⇒ V = - ri + E
Slope of graph ′V′ and ′i′ gives ′r′ intercept of graph
′V′ and ′i′ gives E ⇒ tan θ =
= r.
Slope of graph ′V′ and ′i′ gives ′r′ intercept of graph
′V′ and ′i′ gives E ⇒ tan θ =
= r.Create a free account to view solution
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