MasteringPhysics: HW-CH25-Google Chrome https:// eringphysics myc t/itemView?ass

Question

MasteringPhysics: HW-CH25-Google Chrome https:// eringphysics myc t/itemView?assignmentProblemID-62350241 Spring 2016_PHYS193 26692 L02 PlusHzs Item 3 ourses Item 3 e Home Part A A current-carrying gold wire has a diameter of 0 87 mm. The electric field in the wire is 0.45 V/m What is the current carried by the wire? Express your answer using two significant figures. us nments se Tools ter Conte My Answers Give Up y Area Part B What is the potential difference between two points in the wire 6 1 m apart? Express your answer using two significant figures. y Answers Give Uv

Explanation / Answer

Part A)    current carried by wire , I = E * A/resistivity

                                                        = 0.45 * (3.14 * 0.435 * 10-3 * 0.435 * 10-3)/(2.44 *10-8)

                                                       =    10.95 A

Part B)     Potential difference between two points = E * d

                                                                          =   0.45 * 6.1 = 2.745 V

Part C)    Resistance of this wire =   2.745/10.95

                                                     =   0.2506 ohm

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