Question

The reactance of inductance at ${10}^{4}Hz$ is ${10}^4\Omega$. Its reactance at $2\times {10}^{4}Hz$ will be :

• A. ${10}^4\Omega$
• B. $2\times {10}^4\Omega$
• C. $3\times {10}^4\Omega$
• D. $4\times {10}^4\Omega$

Answer 1

The correct option is B $2\times {10}^4\Omega$

$X_L=wL=2\pi fL$
$X_L\propto f$
If frequency is double, then reactance will be double.