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)

From Ohm's law we have,
$V=IR$
$\Rightarrow R=\frac{V}{I}$
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