Battery shown in figure has e.m.f. E and internal resistance r. Current in the circuit can be varied sliding the contact J. If at any instant current flowing through the circuit is I, potential difference between terminals of the cell is V, thermal power generated in the cell is equal to η η fraction of total electrical power generated in it.; then which of the following graph is correct
and
are correct
Text Solution
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Terminal voltage 
Hence the graph between V and i will be a straight line having negative slope and positive intercept.
Thermal power generated in the external circuit
Hence graph between P and I will be a parabola passing through origin.
Also at an instant, thermal power generated in the cell = 
and total electrical power generated in the cell = Ei.
Hence the fraction 
so 
.
It means graph between η η and I will be a straight line passing through origin.
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