Electricity: Static Electricity

Static Electricity: Audio Guided Solution

Problem 21:

The electric field between the plates of the cathode ray tube of an older television set can be as high as 2.5x104 N/C. Determine the force and resulting acceleration of an electron (m = 9.11x10-31 kg) as it travels through this electric field towards the television screen.

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.