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An electroencephalogram (EEG) records a brain activity using 12 mV,7.8 Hz which is applied to a...

An electroencephalogram (EEG) records a brain activity using 12 mV,7.8 Hz which is applied to
a capacitor, producing a current of 100 mA. If resistance is negligible, how can you evaluate the
capacitance of capacitor? In EEG machine’s tuning circuit has 40 Ω resistor, a 150 mH inductor and
a capacitor of 20 μF in series with 240V,50 Hz supply. How can you evaluate the maximum current
passing through the circuit and its power factor? What will be the change in power factor when the
frequency is increased to 500 Hz? Support your answer.

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