A 10 Ω resistance, 5 mH coil and 10 μF capacitor are joined in series. When an alternating current source of suitable frequency is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency
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a
Is halved
b
Is doubled
c
Remains unchanged
d
Is quadrupled
answer is C.
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Detailed Solution
Resonant frequency =12πLC. It does not depend on resistance.