Premium Online Home Tutors
3 Tutor System
Starting just at 265/hour

A copper wire has diameter 0.5 mm and resistivity of \( 1.6 × 10^-8 \Omega m. \) What will be the length of this wire to make its resistance 10 \(\Omega \)? How much does the resistance change if the diameter is doubled?


Answer :


Area of cross-section of the wire, A =\(\pi \) (d/2) 2 Diameter= 0.5 mm = 0.0005 m Resistance, R = 10 \(\Omega \) We know that

NCERT solutions of related questions for Electricity

NCERT solutions of related chapters class 10 maths

NCERT solutions of related chapters class 10 science