Electric Circuits
The delta equation of given star connected impedance ZQR is equal to

 40 Ω.
 (5 + j10 / 3) Ω.
 (20 + j10) Ω.
  (10 + j30) Ω.

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Electric Circuits
Atoms have no electric charge because they

 have neutrons in their nuclei.
 have an equal number of neutrons and protons.
 have an equal number of electrons and protons.
 have an equal number of charged and non charged particles.

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