question_answer

If in the circuit, power dissipation is 150 W, then R is   AIEEE  Solved  Paper-2002

A) \[2\,\,\Omega \]                                

B)           \[6\,\,\Omega \]                

C)           \[5\,\,\Omega \]                

D)           \[4\,\,\Omega \]

Correct Answer: B

Solution :

As power \[P=\frac{{{V}^{2}}}{{{R}_{net}}}\] (as V is constant in parallel)                           \[\Rightarrow \]   \[150=\frac{{{(15)}^{2}}}{\frac{R\times 2}{2+R}}\Rightarrow R=6\,\,\Omega \]