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NEET 2012

Exam: NEET
Year: 2012
Subject: Physics
Chapter: Current Electricity

NEET 2012 · Physics · Current Electricity

The power dissipated in the circuit shown in the figure is 30 Watt....

The power dissipated in the circuit shown in the figure is 30 Watt. The value of

R

is

The power dissipated in the circuit shown in the figure is 30 Watt. The value of R is

Options

A $20 \Omega$
B $15 \Omega$
C $10 \Omega$
D $30 \Omega$

Correct answer

C. $10 \Omega$

Step-by-step solution

Here,

R_1=R=

? R_2=5 \Omega, V=10

\mathrm{~V}

and

\quad P=30 \mathrm{~W}

Hence

\begin{aligned}P & =\frac{V^2}{R_1}+\frac{V^2}{R_2}\\ \frac{10^2}{R}& =30-\frac{10^2}{5}\\ \frac{100}{R}& =30-20 \\ R & =10 \Omega \end{aligned}

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