A wire of length 15cm gives 10Ω resistance in a circuit. Find the resistance of the wire if (a) the wire is stretched to Double its length (b) the wire is doubled on itself.
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A wire of length 15cm gives 10Ω resistance in a circuit. Find the resistance of the wire if (a) the wire is stretched to Double its length (b) the wire is doubled on itself.
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R resistance is d proportional to l/A
Hence resistance increases by 4 times.
Hence R = 40 ohm.
If the wire is double on itself then resistance becomes 10/4 = 2.5 ohm