Current Electricity and Electrical InstrumentHard

Question

A battery of emf E and internal resistance r is connected across a resistance R. Resistance R can be adjusted to any value greater than or equal to zero. A graph is plotted between the current (i) passing through the resistance and potential difference (V) across it. Select the correct alternative (s)

Options

A.Internal resistance of battery is 5Ω
B.Emf of the battery is 20V
C.Maximum current which can be taken from the battery is 4A
D.V-i graph can never be a straight line as shown in figure

Solution

Slope of ′V′ vs ′i′ graph give internal resistance
∴ r = 5Ω
Intercept gives the value of e.m.f. E = 10 volt
Maximum current is imax = ⇒ 2A

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