InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Iron and silicon wires are heated from 30°C to 50°C. The correct statement is that :(a) resistance of iron wire decreases(b) resistance of iron wire increases and that of silicon wire decreases(c) resistance of iron wire decreases and that of silicon wire increases(d) resistance of both wires increases |
| Answer» <p><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif"><strong>Correct option (b) resistance of iron wire increases and that of silicon wire decreases</strong></span></span></p><p><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif"><strong>Explanation:</strong></span></span></p><p style="text-align:justify"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif">Iron is a metal and silicon is a semiconductor. The resistivity of metal is directly proportional to its absolute temperature but the resistivity of semiconductor is inversely proportional to its absolute temperature. Hence, resistivity of metallic wire like iron increases and resistivity of silicon wire decreases with the increase of temperature.</span></span></p> | |