Physics
Copper wires are generally used for electrical power transmission instead of iron wire because :

Copper is cheaper than iron
Copper is lighter than iron
Copper can take higher power than iron
Copper is a better conductor of electricity than iron

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Physics
Isotopes of an element contain

the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of protons and electrons
equal number of nucleons

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