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I have two probles to tackle on RLC circuits

The first states that if a circuit consists of a lamp (R), variable inductance and fixed capacitor, why does the lamp glow for certain values of L.

Also, you have a tuner at 100mhz, the resistance in the circuit is 15 ohms and inductance 1.50 micro henry's, what capacitance should be used in the circuit?

Any hints would be good

Thanks