AP Free Response Question
2006 B3
Printer Friendly Version
Two point charges, q
_{1}
and q
_{2}
, are placed 0.30 m apart on the x-axis, as shown in the figure above. Charge q
_{1}
has a value of —3.0 x 10
^{-9}
C. The net electric field at point P is zero.
(a) What is the sign of charge q
_{2}
: positive or negative? Justify your answer.
(b) Calculate the magnitude of charge q
_{2}
.
(c) Calculate the magnitude of the electric force on q
_{2}
and indicate its direction.
(d) Determine the x-coordinate of the point on the line between the two charges at which the electric potential is zero.
(e) How much work must be done by an external force to bring an electron from infinity to the point at which the electric potential is zero? Explain your reasoning.
Topic Formulas
Description
Published Formula
capacitance
Coulomb's Law
electric field
electric potential energy
energy stored in a capacitor
parallel-plate capacitor
potential and electric field strength
potential due to a collection of point charges
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