In a wire with a 2.01 mm² cross-sectional area, 8.49 × 1020 electrons flow past any point during 2.97 s. What is the current I in the wire? I = A Determine the current density J. J = A/m²
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- A wire has a current density of 6.71 × 10° A/m2. If the cross-sectional area of the wire is 1.03 mm2, what current I does the wire carry? I = A With this current, how much time t is required for 3.99 × 1020 electrons to pass any point on the wire? t = SA typical lightning bolt may last for 0.197 s and transfer 1.19 x 1040 electrons. Calculate the average current (in A) in the lightning bolt. HINT AA change of 401 C charge pass through an imaginary plane during a time interval of 2.0 minutes. What is the current in amps (coulombs per second)? Current = Charge/time (convert minutes to seconds). Enter units as A or C/s
- A long, cylindrical wire with a length of 1.5 m and a cross-sectional area of 5.0 mm2 carries a steady current of 5.0 A. If the number density of free electron carriers in the wire is 8.0 x 1028 e- ' s/m3, what is the drift velocity of the free electrons that carry the current? a. 6.5 x 10-7 m/s b. 7.8 x 10-7 m/s c. 4.2 x 10-7 m/s d. 9.7 x 10-7 m/s e. 2.1 x 10-6 m/sIn a wire with a 2.17 mm2 cross-sectional area, 7.19 × 1020 electrons flow past any point during 3.09 s. What is the current I in the wire? I = A Determine the current density J. J = A/m?An aluminum wire having a cross-sectional area equal to 2.00 x 106 m2 carries a current of 3.50 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire. .00001822 X
- The current in a wire at time t is given by the expression I(t) = (2.4 A) e−t/(2.3 µs), where t is in µs. a. Graph I vs t for the interval 0 ≤ t ≤ 10 μs. b. Find an expression for the total amount of charge that has entered the wire at time t if Q(0) = 0 C. c. Graph the total amount of charge that has entered the wire as a function of time for the same interval as in part a.A current of 500 A flows in a 30 km long copper transmission line (diameter 1.0 cm). a) What is the current density? b) What is the drift speed of the booking drivers? c) How long does it take for a single electron to travel from one end of the transmission line to the other? The number (density) of free charge carriers (electrons) is 8.5×1028 m-3A wire has a current density of 7.09 x 10° A/m?. If the cross-sectional area of the wire is 2.11 mm², what current I does the wire carry? A. With this current, how much time t is required for 4.05 x 100 electrons to pass any point on the wire?