Question

When the net reactance in a series coil-capacitor circuit is zero at frequency f, the nature of its reactance of frequency 2f is

Answer 1

Answer:

Nature of its reactance of frequency 2f will be inductive type.

Explanation:

At frequency f the net reactance is zero

X = XL - XC = 0

=> XL = XC

or

ωL = 1/ωC

As the frequency(ω) increases, the inductive reactance increases because it is directly proportional to ω whereas the capacitive reactance decreases because it is inversely proportional to ω, So the difference between them will be of inductive in nature.

X = XL - XC = +ve (as XL > XC)

Hence nature of its reactance of frequency 2f will be inductive type.