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Electric field of point charge

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At a distance r1 from a point charge, the magnitude of the electric field created by the charge is 248 N/C. At a distance r2 from the charge, the field has a magnitude of 132 N/C. What is the ratio r2/r1?

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Solution Summary

The solution shows detailed calculation of the electric field by a point charge using Coulomb's law.

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See Also This Related BrainMass Solution

Electric Field Equation and Point Charges

See the attached file.
Activity Three: Place a positive charge and a negative charge close to each other to create a dipole. Again, predict what the field will look like. Then, test your prediction.

If your observation is different than your prediction, explain here what was wrong in your original thinking.

Include in your lab book the equation of the E-field at the black point for the above dipole where d >> s.

Activity Four: Make a line of positive charge. Predict what the field will look like. Then, test your prediction.

If your observation is different than your prediction, explain here what was wrong in your original thinking.

Write in your lab book how to find the electric field of a uniformly charged rod of length L at a distance r away from the center of the rod.

Activity Five: Draw a Parallel-Plate capacitor on the slightly-resistive paper using the conductive ink. Predict what the E-Field is going to look like, then test your prediction using the "E-Field Meter". After that, test your prediction on the website.

Activity Six: Describe, in words and picture again, just what an E-field is. Are there any changes from your original definition?

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