Physics
The earth-wire of a cable is connected to

The fuse of the appliance
The filament of the appliance
The outer metallic body of the appliance
Short circuitry of the appliance

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Physics
What is refractive index ?

It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
None of above
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

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