Physics
Superconductors are substances which

conduct electricity at high temperatures
conduct electricity at low temperature
offer no resistance to the flow of electricity
offer high resistance to the flow of current

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Physics
Which of the following options correctly explains the term heat budget?

It is the radiation from the earth in the form of long waves.
It is the amount of heat which the surface of earth receives from the sun.
It is a mode of transfer of heat through matter by molecular activity.
It is the balance between incoming and outgoing radiation

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