Answer Posted / libin rs

neutral line as it name indicates it is always neutral. there is no pd between two neutral line( pd=0 )in the case of phase there 'll be a pd. but on considering the earth line which is connected to the metal parts of the equipment. if there is happen to be a short circuit it generate a pd between other two lines.
second one is earth line is not an actual return path of the current.when we apply more equipment in our connection in the home and we use earth wire instead of neutral the proper current and voltage will be less. actual there is less pd b/n earth and phase.

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