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Q4. 9'! Describe an application of a material with a small resistivity value. Iron has a resistivity of p = 9.71 x 10'8 Elm. An

Q4. 9'!\" Describe an application of a material with a small resistivity value. Iron has a resistivity of p = 9.71 x 10'8 Elm. An iron wire has a radius of 1.25 mm and a length of 0.92 m. Calculate the resistance of this wire. If the diameter of the wire is halved. what will be the value of the new resistance

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