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The student sets up an experiment in the lab to determine the internal resistance of a cell by…
The student sets up an experiment in the lab to determine the internal resistance of a cell by graphical method. The setup of the circuit is done as shown below using a cell of e.m.f. ‘E’ and internal resistance ‘r’, a variable resistor ‘R’, and a milliammeter. A voltmeter ‘V’ is connected to the circuit as shown.
(a)
Draw the nature of the graph so determined. What does the Y-intercept of the graph represent?
(b)
How can internal resistance be calculated from the graph?
Answer
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From ISC 2025 Practice Physics, question 59.