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A 400 mH coil of negligible resistance i...

A 400 mH coil of negligible resistance is connected to an AC circuit in which an effective current of 6 mA is flowing. Find out the voltage across the coil if the frequency is 1000 Hz.

Text Solution

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`L=400xx10^(-3)H,I_(eff)=6xx10^(-3)A,f=1000Hz`
Inductive reactance, `X_(L)=Lomega=Lxx2pif=2xx3.14xx100xx0.4=2512Omega`
Voltage across L, `V=IX_(L)=6xx10^(-3)xx2512=15.072V`(RMS)
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