Electric Circuits
In a lead acid cell PbSO4 formed during

  both during charging as well as discharging.
  discharging only.
  charging only.
  neither during charging nor discharging.

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Electric Circuits
A pole of driving point impedance is

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

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