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In a domestic three-wire system, which wire provides the safety connection to earth?
ALive wire (red)
BEarth wire (green)
CNeutral wire (black)
DFuse wire (yellow)
Answer & Solution
Correct answer: B. Earth wire (green)
1. Indian domestic supply uses three wires: live, neutral, and earth.
2. The live wire is at high potential; the neutral wire returns the current.
3. The earth wire is connected to the metal body of appliances.
4. If a fault makes the body live, current flows safely to earth.
5. The earth wire is colour-coded green in standard wiring.
6. So the green earth wire provides the safety connection.
_Source: NCERT Class 10 Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_
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