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Electricity and Magnetism

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Electricity and Magnetism

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    1. Electricity and Magnetism Review

    3. Electrostatics

    4. Coulomb’s Law

    5. Electric Field

    6. Electric Potential Energy

    7. Electric Potential = Potential Difference = Voltage

    8. Electric Field and Potential

    9. Question 1: Where along the line going through the points is the electric field zero?

    10. Question 2: Where along the line going through the points is the electric potential zero?

    11. Question 3: Which way does the electric field point at the center of the square?

    12. Question 4: Is the electric potential positive, negative, or zero at the center of the square?

    13. Question 5: Which way does the electric field point at the center of the square?

    14. Question 6: Is the electric potential positive, negative, or zero at the center of the square?

    15. Electric Field and Potential Energy

    16. Conductors, Capacitors, and Dielectrics

    17. Connecting a Capacitor to a Battery Charges will separate across the capacitor Charge acquired is directly proportional to the voltage Constant of Proportionality (C) is the capacitance.

    18. Capacitors Store Electric Charge

    19. Energy in a Capacitor energy stored = work done to charge the capacitor Also recall, the work done to move a charge from one potential to another is… W=qV However, in a capacitor the voltage changes as charges are separated, so average beginning and ending voltage…

    20. Combining Equations…

    21. Electric Circuits

    22. Electric Current

    23. Resistance

    24. Resistance

    25. Ohm’s Law

    26. Emf Electromotive Force The source of potential difference E

    27. Series and Parallel Resistors Series: IT = I = I = I VT = V + V + V

    28. Series Circuits As more resistors are added… Total Resistance increases R = R + R + R+… Total Voltage stays the same Battery stays same Total Current decreases V = I R Voltage across each resistor decreases Current through each resistor decreases

    29. Parallel Circuits As more resistors are added… Total Resistance decreases 1/R = 1/R + 1/R + 1/R+… Total Voltage stays the same Battery stays same Total Current increases V = I R Voltage across each resistor stays the same Current through each resistor stays the same

    30. Series and Parallel Capacitors Series: QT = Q = Q = Q VT = V + V + V 1/CT = 1/C + 1/C + 1/C

    31. Magnetic Fields

    32. Right Hand Rule 1a Magnetic force on a moving charge in a B-Field:

    33. Right Hand Rule 1b Magnetic Force on a current-carrying wire in a magnetic field

    34. Right Hand Rule 2a Magnetic Field around a current-carrying wire:

    35. Right Hand Rule 2b Magnetic Field inside a loop or solenoid

    36. The Mass Spectrometer Tool used to measure the abundance of isotopes

    37. The Mass Spectrometer

    38. The Mass Spectrometer

    39. Electromagnetism

    40. Magnetic Flux Flow of a Magnetic Field through an area (measured in Webers)

    41. Induced EMF A changing magnetic field induces a current in a wire.

    42. EMF Induced in a moving conductor: Consider a conducting rod moving in a magnetic field:

    43. EMF Induced in a moving conductor: Consider a conducting rod moving in a magnetic field:

    44. Practice Problem NO NUMBERS!!!! ?

    45. Practice Problem 1 The square loop with sides of length L and resistance R is being pushed at a velocity v through a magnetic field of strength B. Express all answers in terms of the given variables and fundamental constants.

    46. Practice Problem 1 Calculate EMF induced in the loop and the magnitude and direction of current in the loop in each of the following situations: The loop is halfway into the field and still moving to the right The loop is entirely in the field and still moving to the right The loop is halfway out of the field and still moving to the right.

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