Q. An alternating current source of frequency $100\ Hz$ is joined to a combination of a resistance, a capacitance and a coil in series. The potential difference across the coil, the resistance and the capacitor is 46, 8 and $40\ volt$ respectively. The electromotive force of alternating current source in $volt$ is
A) 94
B) 14
C) 10
D) 76
Explanation
(c) $V_{L} = 46\ volts,\ V_{C} = 40\ volts,\ V_{R} = 8\ volts$
E.M.F. of source $V = \sqrt{8^{2} + (46 - 40)^{2}} = 10\ volts$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.