C_potential 2009

C_potential 2009 - Physics C Electric Potential Name:_ Is...

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Physics C Electric Potential Name:__________________ Is the electrical force conservative or non- conservative? What characterizes a conservative force? How does the change in a electrical potential energy relate to work? Write an equation that expresses the relationship between electrical potential energy and work done by an electrostatic force. Field Refresher + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - High Potential (voltage) Low Potential (voltage) Electric Field Equi-potential Surfaces + A + B + C The work done by an electrical force in moving a charge q from point A to point B is given by: Uniform field: Non-uniform field: This results in a potential energy change of Uniform field: Non-uniform field: Electric Potential Definition: Mathematical relationship to potential energy: Sample Problem: A proton is accelerated through a potential difference of -20,000 V. What is the potential and kinetic energy change of the proton? How much work did the electric field do on the proton? Sample Problem: How fast is a 2 MeV alpha particle moving? What potential difference is needed to stop this alpha particle? Sample Problem: An electric field is given by E = 250 i V/m. A 12.0 s C charge moves from the origin to (0.20 m, 0.50 m). What is the change in potential energy and electric potential for the charge? 1/15/2010 1 Bertrand
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Sample Problem: An electron is released from rest in an electric field of magnitude by 5900 V/m. Through what potential difference will it have passed after moving 1.00 cm? How fast will it be moving at this time? Equi-potential or Iso-potential surfaces Definition: Characteristics: Draw the field lines and equi-potential surfaces around a positive point charge Sample Problem: Find the potential at a distance of 1.00 cm from a proton. Repeat for an electron. 1/15/2010 2 Bertrand
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Sample Problem: Two point charges (5.0 nC and -3.0 nC) are separated by 35 cm. What is the potential energy of the pair? What is the electric potential at a point midway between the charges? Mathematically, how do you determine the electric field from the electric potential if you know how the potential changes with position? What can you say about how field strength relates to the rate at which the electric potential is changing? Sample Problem: The electric potential in a region is given by the function V = -9.0 x V/m – 3.0 x 2 V/m 2 . What is the magnitude and direction of the electric field at x = 2.0 m? Sample Problem: Over a region of space, the electric potential is given by V = -3.0 x + 6.0 x y – 2.0 x 2 y. Derive the vector representing the electric
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C_potential 2009 - Physics C Electric Potential Name:_ Is...

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