Question

The practical unit of resistance is $\Omega .1 \, \Omega$ is equal to:

• A. $10^{18}$ emu
• B. $10^9$ emu
• C. $10^{15}$ emu
• D. none of these

Answer 1

Answer: (B)

$10^9$ emu

Answer 2

From Ohm's law we have, $V =I R$ $\Rightarrow R =\frac{V}{I}$ where, $R$ is resistance, $V$ is voltage and $I$ is current. Also unit of voltage is $10^{8}$ emu of potential and unit of current is $\frac{1}{10}$ emu of current. $\therefore R =\frac{10^{8} \text{emu of potential }}{\frac{1}{10} \text{emu of current }}$ $=10^{9}$ emu of resistance