A 2.0-?F capacitor that is initially uncharged is charged through a 50-k? resistor. How long does it take for the capacitor to reach 90% of its full charge?
A) 0.90 s B) 2.2 s C) 0.23 s D) 2.3 s
C
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First Law of Thermodynamics: The figure shows a pV diagram of a gas for a complete cycle. During part bc of the cycle, 1190 J of heat flows into a system, and at the same time the system expands against a constant external pressure of 7.00 × 104 Pa as its volume increases from 0.0200 m3 to 0.0800 m3. Calculate the change in internal (thermal) energy of the system during part bc of the cycle. If the change is nonzero, be sure to indicate whether the change is positive or negative.
Fill in the blank(s) with the appropriate word(s).
A segment of wire carries a current of 25 A along the x axis from x = ?2.0 m to x = 0 and then along the y axis from y = 0 to y = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
A. 2.0 N B. 5.0 N C. 1.0 N D. 3.6 N E. 3.0 N
When a switch is closed to complete a DC series RL circuit,
A. the electric field in the wires increases to a maximum value. B. the magnetic field outside the wires increases to a maximum value. C. the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed. D. all of the above are true. E. only (a) and (c) above are true.
A current in a long, straight wire produces a magnetic field. The magnetic field lines:
a. go out from the wire to infinity. b. form circles that go around the wire. c. come in from infinity to the wire. d. form circles that pass through the wire.