JEE MainPhysicsAlternating CurrentNumerical+4 / −1
A transmitting station releases waves of wavelength 960 m. A capacitor of 2.56 F is used in the resonant circuit. The self inductance of coil necessary for resonance is 10 8 H.
Numerical answer
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Correct answer: 10
- Use the relation between wavelength and frequency
For electromagnetic waves, where
So,
- Condition for resonance of an LC circuit
At resonance,
Hence,
Given capacitance:
- Substitute the values
Using
Now,
So,
Using ,
Also,
Therefore,
- Match with the asked form
The inductance is
So the required integer is
- Comparison with stored answer
Derived answer =
Stored correct answer =
Hence, they agree.
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