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Electric Potential quiz #2

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  • How is the voltage of a battery in a circuit defined?
    The voltage of a battery in a circuit is the potential difference between its terminals, also known as its emf.
  • How do you express the reading of a voltmeter in terms of the emf (E) of a battery?
    The voltmeter reading is equal to the emf (E) if no current flows, or less than E if there is internal resistance and current flows.
  • How do you express the reading of a voltmeter in terms of the emf (E) of a battery?
    The voltmeter reading is equal to the emf (E) if no current flows, or less than E if there is internal resistance and current flows.
  • How do you express the reading of a voltmeter in terms of the emf (E) of a battery?
    The voltmeter reading is equal to the emf (E) if no current flows, or less than E if there is internal resistance and current flows.
  • How is voltage defined in terms of energy and charge?
    Voltage is defined as the electric potential energy per unit charge, V = U/Q.
  • What does a voltmeter test in a circuit?
    A voltmeter tests the potential difference (voltage) between two points in a circuit.
  • A volt is a unit of which physical quantity?
    A volt is a unit of electric potential or electric potential difference.
  • Between two points, a and b, which has a larger electric potential if a positive charge moves from a to b and gains energy?
    Point b has a larger electric potential if a positive charge moves from a to b and gains energy.
  • How do you calculate the voltage across a resistor in a circuit?
    The voltage across a resistor is the potential difference between its two ends, calculated as ΔV = V_end - V_start.
  • For a point charge, how does the electric potential vary with distance from the charge?
    For a point charge, the electric potential varies inversely with distance: V = kQ/r.
  • How do you determine the potential difference across a resistor in a circuit?
    The potential difference across a resistor is the voltage drop, equal to the difference in electric potential between its two ends.
  • How do you calculate the electric potential at a point indicated by a dot near a point charge?
    The electric potential at the point is V = kQ/r, where r is the distance from the charge to the dot.
  • What is the electric potential difference between the ground and a cloud during a thunderstorm?
    The electric potential difference between the ground and a cloud during a thunderstorm is the voltage that drives lightning, often several million volts.
  • How do you find the potential difference between point a and point c?
    The potential difference between point a and point c is ΔV = Va - Vc.
  • How do you calculate the electric potential at point a due to a point charge?
    The electric potential at point a due to a point charge is V = kQ/r, where r is the distance from the charge to point a.
  • What is another term commonly used for electric voltage in physics?
    Another term for electric voltage is potential difference.
  • What does voltage describe in the context of electric potential?
    Voltage describes the difference in electric potential between two points, indicating how much energy per unit charge is gained or lost when moving between those points.
  • What is the unit of measurement for electric potential (voltage)?
    The unit of measurement for electric potential (voltage) is the volt (V), which is defined as one joule per coulomb.
  • Which symbol and unit are used to represent electric potential (voltage)?
    Electric potential (voltage) is represented by the symbol 'V', and its unit is also the volt (V).
  • How is electric potential (V) mathematically defined in terms of electric potential energy and charge?
    Electric potential (V) is defined as the electric potential energy (U) per unit charge (Q), given by the equation V = U/Q.
  • What is the difference between voltage and volts in the context of electric potential?
    Voltage refers to the potential difference (ΔV) between two points, while volts (V) are the units used to measure electric potential at a single point.