1.

An alternating current source of frequency 100 Hz is joined to a series combination of a resistance, a capacitance and a coil in series. The potential difference across the coil, the resistance and the capacitor is 46, 40 and 8 volt respectively. What is the electromotive force of alternating current source in volt ?

Answer»

94
14
10
76

Solution :`V^2=V_R^2 + (V_L-V_C)^2`
`V_L=46, V_R=8, V_C=40`
`=8^2+(46-40)^2`
`=8^2+6^2`
=64+36
`V^2`= 100
`THEREFORE` V=10 V


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