1.

The power dissipated in the circuit shown in the is 30 watts. The value of `R` is A. `20 Omega`B. `15 Omega`C. `10 Omega`D. `30 Omega`

Answer» Correct Answer - c
Equivalent resistance of circuit `R_(eq) = (5R)/(5+R)`
Power dissipated,
`P = (V^(2))/(R_(eq)) or R_(eq) = (V^(2))/(P) = (10^(2))/(30) = (10)/(3)`
`:. (10)/(3) = (5R)/(5+R) or 50 + 10R = 15 R or R = 10 Omega`


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