Electric Circuits
The resistance of a strip of copper of rectangular cross section is 2 Ω. A metal of resistivity twice that of a copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

 3 / 2 Ω.
 6 Ω.
 4 / 3 Ω.
 3 / 4 Ω.

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Electric Circuits
Atoms have no electric charge because they

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

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