The OP-amp can amplify 1. a.c. signals only 2. d.c. signals only 3. both a.c. and d.c. signals 4. neither d.c. nor a.c. signals.

The OP-amp can amplify both a.c. and d.c. signals. An integrated circuit known as an operational amplifier (Op-Amp) amplifies the difference between two input voltages and generates a single output.

What OP-amp can Amplify:

• An operational amplifier is a voltage amplifier with a very high gain.
• By boosting the signals' amplitude, it is utilized to magnify them.
• Both DC and AC signals can be amplified using op-amps.
• When two input signals differ, the ideal Op-Amp detects this difference and amplifies it to create an output signal. The voltage at the output terminal measured concerning the ground is known as the output terminal.
• A voltage-amplifying device called an operational amplifier, or op-amp for short, is created to be utilized with external feedback elements like resistors and capacitors between its output and input terminals.
• Under the many feedback topologies, whether resistive, capacitive or both, the amplifier can perform various operations, giving rise to its name of "Operational Amplifier."
• These feedback components dictate the resulting function or "operation" of the amplifier.