A) 100 Hz
B) 75 Hz
C) 60 Hz
D) 30 Hz
E) 50 Hz
Correct Answer: E
Solution :
Resistance of coil\[(R)=\frac{200}{1}200\,\Omega \] Current \[I=\frac{200}{\sqrt{{{R}^{2}}+X_{L}^{2}}}\] Or \[0.5=\frac{200}{\sqrt{{{R}^{2}}+X_{L}^{2}}}\] Or \[{{R}^{2}}+{{(2\pi fL)}^{2}}={{(400)}^{2}}\] Or \[or{{\left( 2\pi f\times \frac{2\sqrt{3}}{\pi } \right)}^{2}}={{(400)}^{2}}-{{(200)}^{2}}\] \[=120000\] Or \[4f\sqrt{3}=200\sqrt{3}\] Or \[f=50\,Hz\]You need to login to perform this action.
You will be redirected in
3 sec