|
|
|||||||||||||||||||
|
18. A charge of +125 µC is fixed at the center of a square
that is 0.64 m on a side. How much work is done by the
electric force as a charge of +7.0 µC is moved from one corner of the square to any other empty
corner? Explain. |
|||||||||||||||||||
|
|
|||||||||||||||||||
|
|
|||||||||||||||||||
|
Since this
a square the distance from the center of the square to any of the four
corners is the same. Therefore the electric potential at each of the four
corners is the same. So moving the
charge from one corner to any other corner results in the same electrical
potential energy. Therefore
the work done is zero! |
|||||||||||||||||||
|
|
|||||||||||||||||||
|
|
|||||||||||||||||||
|
But |
|||||||||||||||||||
|
|
|||||||||||||||||||
|
|
|||||||||||||||||||
|
|||||||||||||||||||
|
|
|||||||||||||||||||
|
|
|||||||||||||||||||
|
|||||||||||||||||||
|
|
