Physics
A dynamo is used to convert

Electrical energy into magnetic energy
Electrical energy into mechanical energy
Magnetic energy into mechanical energy
Mechanical energy into electrical energy

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat
The person can sit on it like a raft
It decreases the volume of the person to keep him afloat

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