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Question 10: NCERT Solutions for 12th Class Physics: Chapter 7-Alternating Current
A radio can tune over the frequency range of a portion of MW broadcast band: (800 kHz to 1200 kHz), if its LC circuit has an effective inductance of 200 μH, what must be the range of its variable capacitor?
Solution:
For tuning, the natural frequency i.e., the frequency of L-C oscillations should be equal to frequency of radio waves received by the antenna in the form of same frequency current in the L-C circuit. For tuning at 800 kHz, required capacitance
So, the variable capacitor should have a frequency range between 87.9 pF to 197.8 pF.
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 7-Alternating Current