Physics
In order to make an electromagnet you need a

Dry cell batteries
Iron nail
All of these
Thin coated copper wire

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Physics
Scalar Quantities are

Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and direction
Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and no direction

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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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