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Input signals are amplified using ___________

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Input signals are amplified using ___________

(a) rectifier

(b) amplifier

(c) oscillator

(d) op amp

I have been asked this question in my homework.

I'd like to ask this question from Simple Oscilloscope topic in division Oscilloscopes of Electrical Measurements

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Right answer is (b) amplifier

For explanation I would say: Vertical amplifier is used in a cathode ray tube to amplify the input signals. Magnitude of the input signal is weak and not sufficient enough to give deflection on the screen.

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