Question Answers

Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A uniform copper wire of mass 2.23× 10^−3 kg carries a current of 1 A when 1.7 V is applied across it. Calculate its length and area of cross-section. If the wire is uniformly stretched to double its length, calculate the new resistance. Density of copper is 8.92 × 103 kgm^−3 and resistivity is 1.7×10^−8Ω m.

A uniform copper wire of mass 2.23× 10^−3 kg carries a current of 1 A when 1.7 V is applied across it. Calculate its length and area of cross-section. If the wire is uniformly stretched to double its length, calculate the new resistance. Density of copper is 8.92 × 103 kgm^−3 and resistivity is 1.7×10^−8Ω m.

A wire of mass m length I and area of cross section A is stretched in such a way that is length increases by 10% of its original value density d Express the changed resistance in percentage.