NCERT SCIENCE - Ch.12 ,Pg-221, EX.QUES -6

6. A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m. What will be the length of this wire to make its resistance 10 Ω? How much does the resistance change if the diameter is doubled?

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R(Parallel) = R / n & R(Series) = n.R Video Link:
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