Which of the wires shown below are the live, neutral and earth wires?

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Solution

Given: a diagram with wires
To find which of them is live, neutral and earth wires
Solution:
R is Earth wire, it has low resistance and is usually connected to metal casing of the appliances and grounded.
P is live wire, it carries electric current to the appliances.
Q is neutral wire, it completes the circuit by forming a path for the current back to the mains. It is usually at zero volts.

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