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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 46V 8V and 40 V respectively. The electromotive force of alternating current source in volt is

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a

94

b

14

c

10

d

76

answer is C.

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Detailed Solution

VL=46 volts,  VC=40  volts,  VR=8  volts E.M.F. of source, V=82+(46−40)2=10 volts
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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 46V 8V and 40 V respectively. The electromotive force of alternating current source in volt is