Electricity: Static Electricity

Static Electricity: Audio Guided Solution

Problem 18:

A test charge with a negative charge of 2.18x10-8 C experiences a northward force of 4.50x10-5 N when placed a distance of 25.0 cm from a source charge.
a. Determine the magnitude and direction of the electric field at this location.
b. Determine the magnitude and type of charge on the source.
c. Determine the strength of the electric field at a distance of 75.0 cm from the source.

Audio Guided Solution

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Habits of an Effective Problem Solver

  • Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
  • Identify the known and unknown quantities; record them in an organized manner. A diagram is a great place to record such information. Equate given values to the symbols used to represent the corresponding quantity - e.g., Q1 = 2.4 μC; Q2 = 3.8 μC; d = 1.8 m; Felect = ???.
  • Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
  • Identify the appropriate formula(s) to use.
  • Perform substitutions and algebraic manipulations in order to solve for the unknown quantity.

Read About It!

Get more information on the topic of Static Electricity at The Physics Classroom Tutorial.

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