A capacitor is charged to 5.0×10-4 C, then discharged by connecting a wire between the two plates. 50 μs after the discharge begins, the capacitor still holds 13% of its original charge. Part A What was the average current during the first 50 μs of the discharge?

Part A A 1.60 m cylindrical rod of diameter 0.450 cm is connected to a power supply that maintains a constant potential difference of 12.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0° C) the ammeter reads 18.7 A. while at 92.0°C it reads 17.0 A. You can Find the resistivity for the material of the rod at 20.0° C. ignore any thermal expansion of the rod. Express your answer in ohm-meters. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperature dependence of resistance. να ΑΣφ N. m Submit Previous Answers Request Answer X Incorrect; Try Again; 7 attempts remaining Part B Find the temperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer in reciprocal degrees Celsius to two significant figures. ? a = (°C) 1 Submit Previous Answers Request Answer X Incorrect; Try Again; 8 attempts remaining

Part A The starter motor of a car engine draws a current of 200 A from the battery. The copper wire to the motor is 4.40 mm in diameter and 1.2 m long. The starter motor runs for 0.980 s until the car engine starts. How much charge passes through the starter motor? Express your answer with the appropriate units. HA ? Value Units Submit Request Answer Part B How far does an electron travel along the wire while the starter motor is on? Express your answer with appropriate HA ? Value Units Submit Request Answer

Consider the following RC circuit with a 5 MQ resistor and 1000 nF capacitor in series. The battery provides a potential of 10 V before the switch is closed at time t=0, the capacitor is uncharged. a. what's the time constant? b. what fraction of the final charge Qf is on the capacitor at t=30 s? C. what fraction of the initial current Io is still flowing at t=30 s? E +1

A 4600 resistor is connected across a charged 0.850 nF capacitor. The initial current through the resistor, just after the connection is made, is measured to be 0.241 A. Part A What magnitude of charge was initially on each plate of this capacitor? Express your answer in microcoulombs. V— ΑΣΦ q= Submit Part B t = Request Answer How long after the connection is made will it take before the charge is reduced to of its maximum value? Express your answer in microseconds. V— ΑΣΦ Submit Request Answer μC ? us

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 Answer

Part C Find the current through the 20 ΩΩ resistor. Part D Find the potential difference across the 20 ΩΩ resistor. Part E Find the current through the 30 ΩΩ resistor.

Part A A 55.0-cm-long hollow nichrome tube of inner diameter 2.8 mm, outer diameter 3.0 mm is connected to a 3.0 V battery. What is the current in the tube? Express your answer with the appropriate units. ? µA I = Value A

A 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 ?

A 90 M2 resistor has a current of 0.68 A and is connected in series with a 110 resistor. Part A What is the emf of the battery to which the resistors are connected? Express your answer using two significant figures. IVE ΑΣΦ ε = ? kV