Physics
Super conductors are substances that

Conduct electricity at low temperature
Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current
Conduct electricity at high temperature

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Physics
What is refractive index ?

None of above
It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

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