First slide

AC Circuits

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

Moderate

A

94
B

14
C

10
D

76

Solution

$V_{L} = 46 volts,$ $V_{C} = 40 volts,$ $V_{R} = 8 volts$
E.M.F. of source $V = \sqrt{8^{2} + {(46 - 40)}^{2}} = 10 volts$

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