a piece of wire is doubled on itself. find new resistance and resistivity ?
Answers
Answer:
Resistance is directly proportional to the length of the wire, and inversely proportional to the cross sectional area of the wire. Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length.
Answer:
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