When a square wave pulse fed to the input of the circuit

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When a square wave pulse fed to the input of the circuit shown in the given figure then V_C, the voltage across C will the waveform:

1. 1
2. 2
3. 3
4. 4

Correct Option: D

From given fig. we conclude that output coming from the C.E. amplifier is connected with low pass filter which acts as a integrator, due to C.E. amplifier the phase of the triangular wave become reverse.
Hence alternative (D) is the correct choice.