Electric Circuits
Two battery having unequal emf

 both a and d
 can be connected in series only.
 cannot be connected in series.
 cannot be connected in parallel.

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Electric Circuits
Atoms have no electric charge because they

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

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