JEE · NEET Previous Year Question
Combination of two identical capacitors, a resistor R and a dc voltage source of voltage 6V is used in an experiment on a (C – R) circuit. It is found that for a parallel combination of the capacitor the time in which the voltage of the fully charged combination reduces to half its original voltage is 10 second. For series combination the time needed for reducing the voltage of the fully charged series combination by half is:
Topic: JEE PYQ
Answer: C. Full step-by-step solution below.
- A10 second
- B5 second
- C2.5 second
- D20 second
Correct answer: C
Solution
(c) Time constant for parallel combination = 2RCTime constant for series combination =
In first case :
= ........(i)
In second case :
= ........(ii)
From (i) & (ii),
=
Þ = = = 2.5 sec.
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