यदि किसी चालक तार की लम्बाई, खींचकर दो गुनी कर दी जाये तब उसका प्रतिरोध कितने गुना बढ़ जाता है ?... VIDEO
यदि किसी चालक तार की लम्बाई, खींचकर दो गुनी कर दी जाये तब उसका प्रतिरोध कितने गुना बढ़ जाता है ? गणना कीजिये।https://bit.ly/YTAI_PWAP https://www.pw.live
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