Question

A wire of resistivity 'r' is stretched to double its length. How does it affect the (a) resistance (b) resistivity?​

Answer 1

Answer: RESISTANCE DOUBLES BUT RESISTIVITY REMAINS SAME............

Explanation: HERE A IMPORTANT THING TO REMEMBER IS RESISTANCE IS AN EXTRINSIC PROPERTY MEANS IT DEPENDS ON EXTERNAL CONDITIONS.SO IT CHANGES IF LENGTH OR AREA IS CHANGED FOR SAME MATERIAL AND RESISTIVITY IS AN INTRINSIC PROPERTY MEANS IT DOES NOT DEPEND ON TEMPERATURE, LENGTH,AREA OR ANY OF THE PROPERTY. IT HAS ITS OWN PROPERTY.

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