Physics
The force between charged particles is called as:

Gravitational Force
Centrifugal Force
Electromagnetic Force
Nuclear Force

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Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are large
The forces of cohesion are very large

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Physics
When a piece of pure silicon is doped with aluminium, then

The doped silicon piece will become p-type
The conductivity of the doped silicon piece will remain the same
The doped silicon piece will become n-type
The resistivity of the doped silicon piece will increase

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