Question
Hard
Solving time: 4 mins
Obtain the answers to (a) and (b) in Exercise 7.15 if the circuit is connected to a 110 V, 12 kHz supply? Hence, explain the statement that a capacitor is a conductor at very high frequencies. Compare this behaviour with that of a capacitor in a dc circuit after the steady state.
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Text solutionVerified
(b)
Or ;
In absence of capacitor, current through the circuit
It follows that when frequency is very high current in the circuit is same, whether capacitor is connected in the circuit or not. In other words, at very high frequency, capacitor behaves like a conductor in an a.c. circuit. For d.c. supply,
Thus in d.c circuit, a capacitor amounts to an open circuit (offer infinite resistance).
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Question Text | Obtain the answers to (a) and (b) in Exercise 7.15 if the circuit is connected to a 110 V, 12 kHz supply? Hence, explain the statement that a capacitor is a conductor at very high frequencies. Compare this behaviour with that of a capacitor in a dc circuit after the steady state. |
Topic | Alternating Current |
Subject | Physics |
Class | Class 12 |
Answer Type | Text solution:1 |
Upvotes | 26 |