Question

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

Answer 1

Answer: (C)

10

Answer 2

$V_{C} = 40volts$, $V_{R} = 8volts$

E.M.F. of source

$V = \sqrt{8^{2} + (46 - 40)^{2}} = 10volts$