Part A A hollow copper wire with an inner diameter of 0.50 mm and an outer diameter of 2.0 mm carries a current of 10 A. What is the current density in the wire? Express your answer to two significant figures and include the appropriate units. • View Available Hint(s) HÀ ? J = Value Units Submit

Part A A 3.4-mm-diameter wire carries a 18 A current when the electric field is 6.5×10-2 V/m What is the wire's resistivity? You may want to review (Pages 753 - 754). Express your answer in ohm-meters to two significant figures. να ΑΣφη ? N. m Submit Request Answer

Part A For what emf Ɛ does the 200 N resistor in the following figure dissipate no power if AV = 150 V ? (Figure 1) Express your answer with the appropriate units. Figure 1 of 1 ? HA Value 100 N 300 N V AV 200 N E?

A flash unit for a camera has a capacitance of 1800 uF . Part A What resistance is needed in this RC circuit if the flash is to charge to 90% of its full charge in 22 s? Express your answer using two significant figures. [ΨΕΙ ΑΣΦ R = Submit Previous Answers Request Answer ? ΚΩ

Two 9.0-cm-diameter metal plates 1.2 cm apart are charged to +12.5 nC. They are suddenly connected together by a 0.218-mm-diameter copper wire stretched taut from the center of one plate to the center of the other. Part A What is the maximum current in the wire? Express your answer with the appropriate units. ► View Available Hint(s) Imax = 2.67 10³ A ?

Part A The starter motor of a car engine draws a current of 120 A from the battery. The wire to the motor is 5.00 mm in diameter and 1.2 m long. The starter motor runs for 0.770 s until the car engine starts. copper How much charge passes through the starter motor? Express your answer with the appropriate units. 円A <. 190 C. Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining Part B How far does an electron travel along the wire while the starter motor is on Express your answer with the appropriate units. HA 0.694 mm Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Tarch

In an integrated circuit, the current density in a 2.3-um-thick x 75-um-wide gold film is 7.0x105 A/m² Part A How much charge flows through the film in 15 min? Express your answer to two significant figures and include the appropriate units. Q = μA Value Submit Request Answer Units ?

Probler It's possible to estimate the percentage of fat in the body by measuring the resistance of the upper leg rather than the upper arm; the calculation is similar. A person's leg meas-ures 40 cm between the knee and the hip, with an average leg diameter (ignoring bone and other poorly conducting tissue) of 12 cm A potential difference of 0.78 V causes a current of 1.6 mA. Part A What are the fractions of muscle and fat in the leg? Express your answer using two significant figures separated by a comma. fm, ff = 91,9

Part A A 1.3x10-3 V/m electric field creates a 4.9x1017 electrons/s current in a 1.5-mm-diameter aluminum wire. What is the drift speed? Express your answer using two significant figures. va = 1.12 • 10-6 m/s Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part B What is the mean time between collisions for electrons in this wire? Express your answer using two significant figures. nνα ΑΣφ ? T = S Submit Request Answer Drovide Cood bools