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Electric Bell

A bulb is con...

Question

A bulb is connected in series with an inductor to an AC supply. How will the brightness of bulb chamge on inserting a diamagnetic core in the inductor?

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Q. An inductor L of inductance

X_{L}

is connected in series with a bulb B and an ac source. How would brightness of the bulb change when (i) number of turn in the inductor is reduced. (ii) an iron rod is inserted in the inductor and (iii) a capacitor of reactance

X_{C} = X_{L}

is inserted in series in the circuit. Justify your answer in each case

Q. A capacitor, an inductor and an electric bulb are connected in series to an AC supply of variable frequency. As the frequency of the supply is increased gradually from zero, then the brightness of the electric bulb is found to

100 W / 200 V

bulb and an inductor are connected in series to a

220 V / 50 H z

supply. Find the power consumed by the bulb.

Q. (i) When an AC source is connected to an ideal inductor, show that the average power supplied by the source over a complete cycle is zero.

(ii) A lamp is connected in series with an inductor and an AC source. What happens to the brightness of the lamp when the key is plugged in and an iron rod is inserted inside the inductor ? Explain.

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