COMEDK2021PhysicsCapacitance

The formula of capacitative reactance is

Options

A2 f C
Bf C 2
CC 2 f
D1 2 f C

Correct answer

D. 1 2 f C

Step-by-step solution

The capacitive reactance X_ C of a capacitor in an alternating current circuit is defined as the opposition offered by the capacitor to the flow of alternating current. The formula for capacitive reactance is given by X_ C = 1 C , where is the angular frequency of the AC source and C is the capacitance. Since the angular frequency is related to the frequency f by the relation = 2 f , substituting this into the expression for X_ C yields X_ C = 1 2 f C . Answer: 1 2 f C

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