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A 10V, 1.5Ω cell is connected in series with a variable resistance R whose value can be varied from zero to 1Ω. If ‘R’ is made to gradually increase from zero to 10 Ω, power dissipated in R.

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increases continuously upto a maximum value

first increases upto a certain value and then remains constant

first increases and then decreases upto a minimum value

remains constant at 125 walt

answer is B.

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Detailed Solution

Power consumed in the external circuit is maximum when R = internal resistance of the cell i.e. when R = 1.5 Ω. Initial power is zero and final power is ${(\frac{10}{10 + 1.5})}^{2} \times 10 wa t t$ .

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