Question

कारण लिखिएः
लाल भूरे रंग का प्रॉपर चूर्ण गर्म करने पश्चात काले रंग का हो जाता है।​

Answer 1

Answer

कारण लिखिएः

लाल भूरे रंग का प्रॉपर चूर्ण गर्म करने पश्चात काले रंग का हो जाता है।

hope it helps you

Answer 2

Answer:

Here comes a proportionality constant called resistivity which only depends on temperature and the nature of material. So if the length of a wire is increased 2 times then its resistance also increases 2 times but its resistivity remains constant as the temperature is constant and the material is same.