Physics
The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as:

Faraday's law
Ohms law
Rault's law
Avogadro's law

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Physics
Ice is packed in saw dust because

Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.
Saw dust is poor conductor of heat.
Saw dust will not get melted easily.

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