Physics
When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.

Law of conservation of energy
Law of Inertia
Newton's third law of motion
Law of conservation of momentum

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Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
The collector has the least concentration of impurity
The base has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity

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