Physics
. . . . . . . . . exerts a force on anything that has an electric charge.

Electrostatic force
Inductive field
Electric field
All of these

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Physics
Skating on ice is possible because

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

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