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Electric Circuits

Electric Circuits
Which of the following is the correct relation?

 all of these.
 AD-BC = 1.
 AB-CD = 1 .
 AC-BD = 1.

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Electric Circuits
When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

 σ ω ε.
 ω ε/σ.
 ω σ/ε.
  σ/ω ε.

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Electric Circuits
KVL works on the principle of

None of these
 law of conservation of energy.
 both.
 law of conservation of charge.

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Electric Circuits
For occurrence of resonance which of the following elements are required?

 L
 C
 Both 2 and 3
 R

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Electric Circuits
The capacitance of a parallel plate capacitor can be varied by

All of these
 changing the overlapping area of the plates only.
 changing the distance between the plates only.
 changing the dielectric medium only.

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 100 Ohms.
 200 Ohms.
 400 Ohms.
 50 Ohms.

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