hey resistivy = 1.5× 10 raise to minus 8 and area of cross section = 20 × 10 raise to minus 4 find the length of the wire required to make 20 Ohm
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R = p_l_
A
20 = -8 × _l_
-4
20 = 2 × l
l = 10 m
A
20 = -8 × _l_
-4
20 = 2 × l
l = 10 m
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