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Wheatstone Bridge

The infinity ...

Question

The infinity resistance plug in a post-office box has

A

an air gap only.

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B

a resistance coil of infinite resistance.

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C

largest resistance available in box.

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D

resistance of the coil 5000

Ω

.

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Solution

The correct option is A an air gap only.
When infinity plug is taken out, air gap is introduced in the circuit. Since air is a bad conductor of current, no current flows in the circuit which implies resistance of infinity resistance is introduced in the circuit.

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