JEE Main 2015 — Alternating Current Question with Solution
JEE Main 2015 (04 Apr)
Question
An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to and then connected to the L and R as shown below:
If a student plots graphs of the square of maximum charge on the capacitor with time (t) for two different values and of L then which of the following represents this graph correctly? (plots are schematic and not drawn to scale)
If a student plots graphs of the square of maximum charge on the capacitor with time (t) for two different values and of L then which of the following represents this graph correctly? (plots are schematic and not drawn to scale)
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
Comparing to the damped pendulum. We write, , is resistive force, Amplitude, . Comparing results, we can write
, as charge decreasing,
.
Exponentially decreasing function, graph has higher values than .
, as charge decreasing,
.
Exponentially decreasing function, graph has higher values than .
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