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Inductors - Engineering

Q1:

A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

A is increased

B is decreased

C does not change

D momentarily goes to zero

ANS:A - is increased

v=L di/dt & XL=2pifL there fore L= XL/2p.
If;
V=XL/2pif * di/dt.
di/dt= V2pif/XL. if frequency decreases, current decreases.