[" (b) A copper wire has a diameter "0.5...

[" (b) A copper wire has a diameter "0.5mm],[" and resistivity of "1.6times10-8" ohm meter."],[" What should be the length of this wire to "],[" make its resistance equal to "10" ohm? How "],[" much the resistance will change,if the "],[" diameter is doubled? "^(***)]

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[" (b) A copper wire has a diameter "0.5mm],[" and resistivity of "1.6times10-8" ohm meter."],[" What should be the length of this wire to "],[" make its resistance equal to "10" ohm? How "],[" much the resistance will change,if the "],[" diameter is doubled? "^(***)]

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