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QAIPM-2002-Ph-2836: NEET 2002 Physics - Class 12 AIPM-2002-Ph-2836 Solution: For a cell terminal potential difference is 2.2 V when circuit…
For a cell terminal potential difference is 2.2 V when circuit is open and reduces to 1.8 V when cell is connected to a resistance of R = . Determine internal resistance of cell (r)
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Step-by-Step Verified Solution
Terminal potential difference is 2.2 V when circuit is open.
_ e.m.f. of the cell = E = 2.2 volt
Now, when the cell is connected to the external resistance, circuit current I is given by
I = E R + r = 2.2 5 + r ampere, where r is the internal resistance of the cell.
Potential difference across the cell = IR
= 2.2 5 + r _ 5 = 1.8
_ 5 + r = 11/1.8.
_ r = 11 1.8 _ 5 = 110 _ 90 18 = 10 9 �