Physics
Which of the following group of elements are diamagnetic?

Hydrogen, oxygen, Argon
Hydrogen, argon, copper
Argon, copper, silver
Oxygen, copper, silver

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Physics
Skating on ice is possible because

The pressure on the ice due to skate raises its melting point
Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The surface of ice is smooth

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