(1) \( \frac{1}{2} \)
(2) \( \frac{1}{\sqrt{2}} \)
(3) \( \frac{\sqrt{3}}{\sqrt{2}} \)
(4) \( 2: 1 \)
51. The equation of current in a purely inductive circuit is \( 5 \sin \left(49 \pi t-30^{\circ}\right) \). If the inductance 30 mH then the equation for the voltage across the inductor, will be : \( \left\{\right. \) Let \( \left.\pi=\frac{22}{7}\right\} \)
(1) \( 1.47 \sin \left(49 \pi t-30^{\circ}\right) \)
Q) \( 1.47 \sin \left(49 \pi t+60^{\circ}\right) \)
(3) \( 23.1 \sin \left(49 \pi t-30^{\circ}\right) \)
(4) \( 23.1 \sin \left(49 \pi t+60^{\circ}\right) \)
