Questions
A thick wire is stretched so that its length becomes two times. Assuming that there is no change in its density then what is the ratio of change in resistance of wire to the initial resistance of wire?
detailed solution
Correct option is C
In stretching R ∝ l2 ⇒R2R1 =l22l12 ⇒ R2R1 = 212⇒R2 =4R1. Change in resistance =R2−R1=3R1Now, Change in resistanceOriginal resistance = 3R1R1=31Talk to our academic expert!
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In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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