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Input impedance depends on _________(a) resistance(b) capacitance(c) inductance(d) voltageI got this question in final exam.This intriguing question comes from Consideration in Selecting Voltmeter topic in chapter Electronic Instruments of Electrical Measurements

Answer»

Correct answer is (B) capacitance

The best I can explain: Shunt capacitance appearing across the input TERMINALS AFFECTS the input impedance. CAPACITIVE reactance of the capacitance is inversely proportional to the frequency.

Xc ∝ ^1⁄f

where, Xc is the capacitive reactance

f is the frequency.



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