Question

In a series electrical circuit comprising of a resistor made up of metallic wire, ammeter reads 5A . The reading of ammeter decreases to half when the length of wire is doubled. Why

Answer 1

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Answer 2

Answer:

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Explanation:

Ans. The inherent property of a conductor because of which it resists the flow of electric current is called resistivity. Resistivity for a particular material is unique

Resistance varies directly as length of the conductor.

Current varies inversely as resistance.

So, when length of the wire is doubled, its resistance becomes double. When resistance becomes double, current becomes half.

This explains why the reading of ammeter decreases to half when the length of the wire is doubled.