Electric Circuits
The arrangement of 12 cells each of internal resistance 1.5 Ohm to give maximum current in external load resistance of 2 Ohm will be

 in 4 parallel rows each row having 3 cells in series.
 all 12 in parallel.
 in 3 parallel rows each row having 4 cells in series.
 all 12 in series.

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Electric Circuits
Atoms have no electric charge because they

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

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