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Resistance

Why does resi...

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Why does resistance become zero at critical temperature as in case of a super conductor?

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Q. At absolute zero temperatures ..... Materials become superconductive..... Electricity pass through them without any resistance ..... According to 'V=IR' , R becomes zero ,then if resistance becomes zero do u think that any kind of potential difference exists???? And if not ...how can electrons travel through a conductor??? at such weird temperatures?

Resistance of a conductor also increases linearly with the temperature. Why and how does this happen?

Q. Assertion :At critical temperature, surface tension of liquid becomes zero. Reason: At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.

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