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Electric Potential - Physics with Calculus

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이 집합의 용어 (20)

  • What condition must the electric field satisfy for electric potential energy to be meaningful?
    The electric field must be conservative to define electric potential energy.
  • Does the order of assembling point charges affect the total work done?
    No, the total work done is independent of the order, though some orderings may simplify calculations.
  • What is the electric field strength in a region where the electric potential is constant?
    The electric field strength is zero because no potential difference exists.
  • Which term is more descriptive: voltage or potential difference?
    Potential difference is more descriptive as it explicitly indicates the difference between potentials at two points.
  • How is potential difference related to electric potential energy?
    Potential difference is a system property; electric potential energy of a charge is the product of the charge magnitude and the potential difference.
  • How do volts and electron-volts differ?
    Volts measure potential difference; electron-volts are units of energy equal to one volt times the electron charge.
  • How does the potential outside a uniformly charged sphere compare to that of a point charge?
    Outside the sphere, the potential is the same as a point charge; inside, it differs.
  • If the electric field is zero throughout a region, what can be said about the electric potential there?
    The electric potential is constant but not necessarily zero.
  • Are there electric field lines between two points at the same potential?
    No, electric field lines connect points of different potential.
  • Can a positively charged conductor have a negative potential?
    Yes, depending on the reference point chosen for zero potential.
  • Why are metal support rods for satellite dishes generally grounded?
    To safely direct lightning strikes into the ground, protecting equipment.
  • What is the relationship between electric field strength units V/m and N/C?
    They are equivalent units for electric field strength.
  • How is the potential difference between two points related to the electric field between parallel plates?
    Potential difference equals electric field strength multiplied by the distance between the points.
  • What is the electric field between two parallel plates separated by distance d with potential difference V?
    Electric field strength is \(E=\frac{V}{d}\).
  • How is the potential energy of two point charges separated by distance r calculated?
    Potential energy is \(U=\frac{k q_1 q_2}{r}\), where k is Coulomb's constant.
  • What is the potential near the surface of a uniformly charged sphere of radius R and charge Q?
    Potential is \(V=\frac{kQ}{R}\) at the surface.
  • How does the electric potential vary inside and outside a charged spherical shell?
    Outside, potential behaves like a point charge; inside, potential is constant.
  • What is the electric field of an infinite line charge with linear charge density λ at distance r?
    Electric field magnitude is \(E=\frac{\lambda}{2\pi\epsilon_0 r}\) directed radially outward.
  • What is the potential difference between two concentric spherical shells with charges Q and -Q?
    Potential difference is \(V=\frac{kQ}{a} - \frac{kQ}{b}\), where a and b are shell radii.
  • How does the electric field support the weight of a free electron near Earth's surface?
    The electric field points downward with magnitude balancing gravitational force, showing electrostatic force is much stronger than gravity.