Electric Circuits
The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

 2R Ω
 4R Ω
 8R Ω
 R Ω

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Electric Circuits
Atoms have no electric charge because they

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

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