Question

a given length of wire is doubled on itself and this process is repeat again. by what factor does the resistance of the wire change.​

Answer 1

• Resistance of a wire is directly proportional to the length of the wire. As its length increases it's resistance increases.
• Let x be the resistance of a wire of length L
• If length of a wires is doubled to 2L its resistance is doubled to 2x
• If it is doubled again, the length of the wire becomes 4L and it's resistance becomes 4x.
• Thus if a given length of a wire is doubled on itself and this process is repeated once again it's resistance increases by a factor of 4

Answer 2

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1)Length

2)Crosssectional area

3)Material used

4)Temperature.