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# Electric Field Equation and Point Charges

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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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Activity One: Describe in your lab book using both, words and/or pictures, the concept of the Electric Field.
Answer: Electric Field is the region in space around an electric charge or a system of charges, within which, other charged particles experience an electrostatic force.
Theoretically, the electric field due to a charged particle or a system of charges, extends upto infinity, but practically this electric field does not show detectable influence on other charged particles beyond a certain limit as the field strength decreases with increase in distance.
The electric field strength or electric field intensity E, for a charged particle or a system of charges, is defined as the ratio of the electrostatic force F, experienced by a positively charged particle + q0 (test charge) placed within the region of the electric field, to the magnitude of charge q0.
Therefore, E = F/ q0 (E and F are vector quantities)
The charges which produce electric field are known as ...

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• MSc, Osmania University
• MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
• BSc, Banaras Hindu University
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