Class 12 Physics
CBSE and UP Board
Alternating Current
Chapter-7 Exercise 7.3
NCERT Solutions for Class 12 Physics Chapter 7 Question 3
A 44 mH inductor is connected to 220 V, 50 Hz ac supply. Determine the rms value of the current in the circuit.
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Inductance of inductor, L = 44 mH = 44 x 10⁻3 H
Supply voltage, V = 220 V,
Frequency, ν = 50 Hz,
Angular frequency, ω = 2πν
Inductive reactance, XL= ωL = 2πνL = 2π x 50 x 44 x 10-3 Ω
rms value of current is given as:
I = V/XL =220/(2π x 50 x 44 x 10-3) =15.92 A
Hence ,the rms value of current in the circuit is 15.92 A