http://phet.colorado.edu/en/simulation/charges-and-fields Explore the following

Question

http://phet.colorado.edu/en/simulation/charges-and-fields

Explore the following three scenarios with the simulation. Build the charge configurations, observe the E-field arrow patterns, and move the sensor around to gauge the field strength at various points. Notice overall patterns.

o Scenario 3: A negative and positive charge, placed apart on a horizontal line. Try different distances between them. What happens?
o Scenario 4: Two positive charges placed apart on a horizontal line. Try different distances between them. What happens?
o Scenario 5: A horizontal line of 20 positive charges. What happens directly at the midpoint, above or below the line of charges?

Question to answer: from your observations, how can you describe how the E-field behaves? How does it depend on the quantities, types, and positions of charges you have? How does it depend on both charge and position? Did you notice anything interesting or unusual about these scenarios?

Explanation / Answer

3. a -ve charge and +ve charge on horizontal line gives electric field of a dipole, which increases in strength as the charges come together
or the sensor gets close to the charges, with electric field lines starting form the +ve charge adn emanting at the -ve charge

4. two positive charges places on horizontal lline, have 0 electric field at the midpoint ofg the line connecting. At toehr places, ekectric filed is always pointing away from them

5. for 20 +ve charges in a horizontal line, the electric field near to the center of this line is nearly constant and does not change appreciabley for small changes in distance

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