A wire of 3 ohm resistance and 10 cm length is stretched to 30 cm length. Assuming that it has a uniform cross section, what will be its new resistance?(2) A wire of 9 ohm resistance having 30 cm length is tripled on itself. What is its new resistance?(3) What length of copper wire of resistivity 1.7x10-8ohm metre and radius 1mm is required so that its resistance is 1 ohm?
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1. New resistance of the wire is 9ohm 2. the resistance is 9ohm. 3. Length= 188.57m
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