Physics
The earth-wire of a cable is connected to

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

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Physics
RADAR is used for:

locating submerged submarines.
locating geostationary satellites.
detecting and locating the position of objects such as Aeroplanes.
receiving a signals in a radio receiver.

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