

InterviewSolution
Saved Bookmarks
1. |
A copper wire has a diameter 0.5mm and resistivity 1.6×10-8ohm- m what will be the length if resistance is 10 ohm |
Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/ans-363318" style="font-weight:bold;" target="_blank" title="Click to know more about ANS">ANS</a>: Area of cross-section of the wire, A =π (d/2) 2</p><p><a href="https://interviewquestions.tuteehub.com/tag/diameter-950836" style="font-weight:bold;" target="_blank" title="Click to know more about DIAMETER">DIAMETER</a>= 0.5 mm = 0.0005 m</p><p>Resistance, <a href="https://interviewquestions.tuteehub.com/tag/r-611811" style="font-weight:bold;" target="_blank" title="Click to know more about R">R</a> = 10 Ω</p><p>We know that</p><p></p><p>∴ <a href="https://interviewquestions.tuteehub.com/tag/length-1071524" style="font-weight:bold;" target="_blank" title="Click to know more about LENGTH">LENGTH</a> of the wire = 122.72m</p><p>If the diameter of the wire is doubled, new diameter=2×0.5=1mm=0.001m</p><p>Let new resistance be Rʹ</p></body></html> | |