Answer all the 3questions
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18- 3
19- 1
20-2
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19- 1
20-2
Hope it helps
madhu461:
explain
18 is obvious, 19 because metal when heated loses strength as it tends to start melting at high temperatures so its resistance decreases, 20 because super conducters are so energized with the cooling that they have a ton of
*conductivity
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