A d.c. supply voltage has an internal resis-
tance of r ohm. A resistive load R is con-
nected across the terminals of the supply.
The power developed in R is maximum
when the value of Ris
(i) √r ohm (ii) r^2 ohm
(iii) r ohm
(iv) none of the above
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Answer: when R=r ohm
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