Q26. In a series electrical circuit comprising a resistor made up of a metallic wire, the
ammeter reads 5A. The reading of the ammeter decreases to half when the length of the
wire is doubled, Why? (2)
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Answer:
Electrical resistivity is an intrinsic property of the conductor. It is basically resistance for a given area of cross-section of conductor per unit length.
When the length of the wire is doubled, the resistance is also doubled, because resistance is directly proportional to the length of wire. Hence according to ohms law for a given potential difference, the current reduces to half.
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