The image below shows two segments of a wire made with a single metal. A current I1 flows into segment 1 from the left, as shown. I How does current density in segment 1"J1" compare to current density in segment 2 "J2"? O J1 > J2 O Ji < J2 O Need more information. O J1 = J2
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- The unspecified currents in (Figure 1) are IA = 3 A and ID = 3 A. The directions of the currents are as noted. Figure IA 7 A Ic IB ID 1 of 1 Part A What is the value of current Ic in the figure? Express your answer with the appropriate units. Ic= 6 Submit Part B X Incorrect; Try Again; One attempt remaining IB = What is the value of current IB in the figure? Express your answer with the appropriate units. Submit A Previous Answers Request Answer Value Provide Feedback ? Units ? Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining Next >The high resistivity of dry skin, about 5 x 105 m, combined with the 1.5 mm thickness of the skin on your palm can limit the flow of current deeper into tissues of the body. Suppose a worker accidentally places his palm against an electrified panel. The palm of an adult is approximately a 9 cm x 9 cm square. Part A What is the approximate resistance of the worker's palm? Express your answer with the appropriate units. μA 6 C ? R= Value 4 Units Submit Request AnswerA current of 0.89 A flows through a copper wire 0.78 mm in diameter when it is connected to a potential difference of 15 V. Part A How long is the wire? Express your answer using two significant figures. VD] ΑΣΦ L = Submit Request Answer Sw ?
- Part A A length of aluminum wire is connected to a precision 10.00-V power supply, and a current of 0.4192 A is precisely measured at 23.5 °C. The wire is placed in a new environment of unknown temperature where the measured current is 0.3698 A . The temperature coefficient of resistivity of aluminum is 0.00429 (°C)-1 What is the unknown temperature? Express your answer using three significant figures. να ΑΣφ ? T = °C Submit Request Answer Provide FeedbackA 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/sThe 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.
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- J = An electron is moving at a constant speed of 23.7 m/s on a circle of radius 3.89 m. o Express the circumference of the circle in terms of its radius, r. Express the time interval, T, for the electron to finish one circle in terms of the circumference and the speed. Express the current in terms of the fundamental charge, e. Calculate the numerical value, in amperes, of the current. Aanswer sheet in the box on the front table. 1. A metallic conductor is carrying a current. The drift speed of the electrons in the conductor is 2.00 mm/s. The resistivity of the conductor is 2.00 x 10 .m. This conductor has 5.00 x 1028 electrons/m°. What is the magnitude of the electric field in the conductor (in V/m)?