ch27-p075 - 75(a The magnitude of the current density...

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75. (a) The magnitude of the current density vector is () ( ) 2 3 12 2 7 4 60.0V 4V 0.127 0.729 2.60 10 m 1.32 10 A m . A iV J AR R RD 2 == = = ++ π πΩ + Ω× (b) V A = V R 1 /( R 1 + R 2 ) = (60.0 V)(0.127 )/(0.127 + 0.729 ) = 8.90 V. (c) The resistivity of wire A is 23 2 8 (0.127 )(2.60 10 m) 1.69 10 m . 4 4(40.0m) AA A RA LL π ρ = = ×
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