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Q.

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.
 

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a

Internal resistors of  battery is 10Ω

b

Maximum current which can be taken from the battery is 4A

c

Internal resistance of battery is 5Ω

d

Emf of the battery is 20V

answer is A.

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Detailed Solution

Equation of straight line

V=10-i5

Comparing with

V=E−ir˙

we get

E = 10V and Internal resistance = 5Ω

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