A wire of resistivity 2.8 x 10^-8 ohm. m and length 20-m must dissipate electrical energy at a rate less than 3.0- W when a 15-A current flows. Calculate the minimum cross-sectional area of the wire.
A wire of resistivity 2.8 x 10^-8 ohm. m and length 20-m must dissipate electrical energy at a rate less than 3.0- W when a 15-A current flows. Calculate the minimum cross-sectional area of the wire.
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