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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❇Resistivity or specific resistance of a material is numerically equal to the resistance of a conductor of length 1m and area of cross section 1m^2.

❇When the length of the wire is doubled, its resistance also doubles (increases), a resistance is directly proportional to length of the wire.

❇Similarly, When its resistance increases, then current decreases, as resistance is inversely proportional to current. 


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Answer 2

Answer:

this is ur answer

it is right

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.