Question

If in the given figure i = 0.25 amp, then the value R will be

• A. $48\Omega$
• B. $12\Omega$
• C. $120\Omega$
• D. $42\Omega$

Answer 1

The correct option is D $42\Omega$

i = 0.25 amp V = 12 V
$R_{eq}=\frac{V}{i}=\frac{12}{0.25}=48\Omega$
Now from the circuit $R_{eq}=R+(60\parallel 20\parallel 10)$

$\Rightarrow R=R_{eq}-6=48-6=42\Omega$