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Watch “A tune collector oscillator has a fixed inductance of 75uH, find the range of variable capacitor.” on YouTube

A tune collector oscillator has a fixed inductance of 75 micro Henry and has to be tunable over the frequency band of 500kHz-1500Khz. find the range of variable capacitor to be used#

QUESTION
“with a suitable diagram show that A.c voltage in a pure inductive circuit leads the current by 90°. Hence, deduce an expression for the instantaneous Power in that circuit”
it expantiate also in “with a suitable diagram show that the A.C voltage in a pure inductive circuit leads the current by 90°”

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Related question
Circuit theorem how to deduce an expression for instantaneous Power