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An electric device delivers a current of 4 A to a device. How many electrons flow through this device
in 8 s? (e = 1.60 x 10-19 C)
At what distance, in centimeters, from the central axis of a long straight thin wire carrying a current
of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's
magnetic field of about 5.0 x 10-5 T? (HO = 47 x 10-7 T m/A)
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