An AC voltage source of variable angular frequency ω and fixed amplitude V0 is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased

Engineering

Physics

LCR and Resonance in AC Circuit

Question

An AC voltage source of variable angular frequency ω and fixed amplitude V₀ is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased

total impedance of the circuit increases

total impedance of the circuit is unchanged

the bulb glows brighter

the bulb glows dimmer

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$z= \frac{V_{0}}{\sqrt{R^{2} + {(\frac{1}{ωc})}^{2}}} ω ↑ \Rightarrow \frac{1}{ωc} ↓ \Rightarrow z ↑$

So, i $↑$ and hence brightness increases.