Electric Circuits
If the sheet of a backelite is inserted between the plates of an air capacitor, the capacitance will

 becomes zero.
 remains unchanged.
 decrease.
 increase.

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Electric Circuits
A pole of driving point impedance is

 zero voltage for a finite value of driving current.
 zero current for a finite value of driving voltage.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving current.

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