Question

A voltage of peak value 283 V and varying frequency is applied to a series L-C-R combination in which R = 3$\Omega$, L = 25 mH and C = 400$\mu$F. The frequency (in Hz) of the source at which maximum power is dissipated in the above circuit is

• A. 100.2
• B. 25.3
• C. 75.4
• D. 50.3

Answer 1

The correct option is D 50.3

In a series L-C-R circuit, maximum power will dissipated at resonance frequency, which is given as
${\omega }_r=\frac{1}{2\pi \sqrt{LC}}=50.3Hz.$.