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What is the current density in a wire with a radius of 0. 815mmcarrying a current of 5.0A? O 2.4 x 1016 A / m

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What is the current density in a wire with a radius of 0. 815mmcarrying a current of 5.0A? O 2.4 x 1016 A / m 2 3.8 x 10 6 A / m 2 O 4.7 x 10^6 A / m 2 O 6.8 x 10^6 A / m 2 O 8.0 x 10^6 A / m 2What quantity is represented by the symbol J ? Current density O Resistivity. O Conductivity. O Complex impedance. O Johnston's constant

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