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:

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

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Physics
The bats can fly in the dark because

They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves
They can see the objects in darkness
They generate flashes of light

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