Phy. Question

2007-07-30 6:44 am

The statement below is incorrect. Please explain.

" The electric field strength is zero at all points where the electric potential is zero. "

回答 (1)

2007-07-30 6:33 pm

✔ 最佳答案

With reference to the diagram below:

圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Jul07/CrazyEfield1.jpg

(E-field value NOT equal to zero, according to the Coulomb's law)
On the other hand, with reference to the formula below:

圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Jul07/CrazyEfield2.jpg

We can see that E-field value is related to the RATE OF CHANGE of POTENTIAL with respect to DISTANCE BUT NOT POTENTIAL VALUE.
A similar analogy can be found in mechanics: Zero acceleration does NOT imply zero velocity NOR vice versa.

參考: My physics knowledge

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