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A coil a capacitor and an `AC` source of rms voltage `24 V` are connected in series. By varying the frequency of the source, a maximum rms current of 6 A is observed. If coil is connected is at DC batteryof emf 12 volt and internal resistance `4Omega`, then current through it in steady state is

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`E_(rms) = 24 V`, `r=40`, `I_(rms) = 6A`
`R=E/I_(rms) = 24/6 = 4 Omega`
Internal Resistance `=4 Omega`
Hence net resistance `=4 +4=8 Omega`
:. `Current = 12/8 1.5A`
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