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Question

What exactly a short circuit means? Choose the correct alternative from the following.

A
The positive and negative terminals of a battery come in contact without the presence of a resistance in between.
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B
The positive and earth terminals of a battery come in contact with the presence of a resistance in between.
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C
Live and neutral wires from the mains come in contact with each other without the presence of a resistance in between.
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D
The positive and earth terminals of a battery come in contact in the presence of a resistance between them.
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Solution

The correct options are
A The positive and negative terminals of a battery come in contact without the presence of a resistance in between.
C Live and neutral wires from the mains come in contact with each other without the presence of a resistance in between.
When the positive and negative terminals of a battery or live and neutral wires from the mains come in contact without the presence of a resistance in between this phenomenon is callled as short circuit. Current from positive or live wire passes to negative or neutral wire without any resistance therefore a large current flows thereby damaging the circuit.

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