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Chapter 26

Chapter 26. DC Circuits. The time constant is  = RC. Charging a capacitor. Discharging a capacitor. Q26.8. You wish to study a resistor in a circuit. To simultaneously measure the current in the resistor and the voltage across the resistor, you would place.

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Chapter 26

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  1. Chapter 26 DC Circuits

  2. The time constant is  = RC. Charging a capacitor

  3. Discharging a capacitor

  4. Q26.8 You wish to study a resistor in a circuit. To simultaneously measure the current in the resistor and the voltage across the resistor, you would place A. an ammeter in series and an voltmeter in series. B. an ammeter in series and an voltmeter in parallel. C. an ammeter in parallel and an voltmeter in series. D. an ammeter in parallel and an voltmeter in parallel.

  5. A26.8 You wish to study a resistor in a circuit. To simultaneously measure the current in the resistor and the voltage across the resistor, you would place A. an ammeter in series and an voltmeter in series. B. an ammeter in series and an voltmeter in parallel. C. an ammeter in parallel and an voltmeter in series. D. an ammeter in parallel and an voltmeter in parallel.

  6. Q26.9 A battery, a capacitor, and a resistor are connected in series. Which of the following affect(s) the maximum charge stored on the capacitor? A. the emf e of the battery B. the capacitance C of the capacitor C. the resistance R of the resistor D. both e and C E. all three of e, C, and R

  7. A26.9 A battery, a capacitor, and a resistor are connected in series. Which of the following affect(s) the maximum charge stored on the capacitor? A. the emf e of the battery B. the capacitance C of the capacitor C. the resistance R of the resistor D. both e and C E. all three of e, C, and R

  8. Chapter 27 Magnetic Fields and Forces

  9. Figure 27.1 at the right shows the forces between magnetic poles. Magnetic poles

  10. Either pole of a permanent magnet will attract a metal like iron, as shown in Figure 27.2 at the right. Magnetism and certain metals

  11. The earth itself is a magnet. Figure 27.3 shows its magnetic field. Magnetic field of the earth

  12. Breaking a bar magnet does not separate its poles, as shown in Figure 27.4 at the right. • There is no experimental evidence for magnetic monopoles. Magnetic monopoles

  13. In 1820, Hans Oersted discovered that a current-carrying wire causes a compass to deflect. (See Figure 27.5 at the right.) • This discovery revealed a connection between moving charge and magnetism. Electric current and magnets

  14. We can write the magnetic force as a vector product (see Figure 27.7 below). • The right-hand rule gives the direction of the force on a positive charge. Magnetic force as a vector product

  15. A27.1 A beam of electrons (which have negative charge q) is coming straight toward you. You put the north pole of a magnet directly above the beam. The magnetic field from the magnet points straight down. Which way will the electron beam deflect? N A. upward B. downward C. to the left D. to the right E. It won’t deflect at all. Beam of electrons coming toward you

  16. Q27.2 When a charged particle moves through a magnetic field, the direction of the magnetic force on the particle at a certain point is A. in the direction of the magnetic field at that point. B. opposite to the direction of the magnetic field at that point. C. perpendicular to the magnetic field at that point. D. none of the above E. One of A or B above, depending on the sign of the particle’s electric charge.

  17. A27.2 When a charged particle moves through a magnetic field, the direction of the magnetic force on the particle at a certain point is A. in the direction of the magnetic field at that point. B. opposite to the direction of the magnetic field at that point. C. perpendicular to the magnetic field at that point. D. none of the above E. One of A or B above, depending on the sign of the particle’s electric charge.

  18. Q27.3 A particle with a positive charge moves in the xz-plane as shown. The magnetic field is in the positive z-direction. The magnetic force on the particle is in A. the positive x-direction. B. the negative x-direction. C. the positive y-direction. D. the negative y-direction. E. none of these

  19. A27.3 A particle with a positive charge moves in the xz-plane as shown. The magnetic field is in the positive z-direction. The magnetic force on the particle is in A. the positive x-direction. B. the negative x-direction. C. the positive y-direction. D. the negative y-direction. E. none of these

  20. Example – calculate field strength of constant magnetic field through surface with area 3.0 cm2 if total magnetic flux is 0.90 mWb Magnetic flux calculations

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