Physics
In a magnetic field, the direction of motion of a current carrying conductor is given by

Maxwell's right hand rule
Flemings left hand rule
Kirchoff's law
Lenz's rule

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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
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
No radiation of heat takes place
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media

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