Question

Consider the circuit shown in figure. The current through the $10\Omega$ resistor when switch $s$ is (a) open (b) closed

• A. $\frac{1}{10}A.\frac{2}{10}A$
• B. $\frac{3}{10}A.\frac{1}{10}A$
• C. $\frac{1}{10}A.\frac{3}{10}A$
• D. None

Answer 1

The correct option is D None

$\begin{array}{c}WhenSisopen,\\ R_{eq}=\left(10+20\right)\Omega =30\Omega \\ i=whenSisclosed,\\ R_{eq}=10\Omega \\ i=\left(\frac{3}{10}\right)\Omega =.03\Omega \end{array}$

Option $D$ is correct.