25.21 . A current-carrying gold wire has diameter 0.84 mm. The electric field in the wire is 0.49 V/m. What are (a) the current car ried by the wire; (b) the potential difference between two points in he wire 6.4 m apart; (c) the resistance of a 6.4-m length of this wire?

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25.21 . A current-carrying gold wire has diameter 0.84 mm. The electric field in the wire is 0.49 V/m. What are (a) the current car ried by the wire; (b) the potential difference between two points in he wire 6.4 m apart; (c) the resistance of a 6.4-m length of this wire?

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