eweqwoewoji
13.09.2019 •
Physics
Two point charges of -7uc and 4uc are a distance of 20
cmapart. how much work does it take to move these charges outto a
separation of 90 cm apart @ a constant speed?
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Ответ:
Approximately 0.979 J.
Explanation:
Assume that the two charges are in vacuum. Apply the coulomb's law to find their initial and final electrical potential energy .
,
where
The coulomb's constant , and are the sizes of the two charges, and is the separation of (the center of) the two charges.Note that there's no negative sign before the fraction.
Make sure that all values are in SI units:
;;Initial separation: ;Final separation: .Apply Coulomb's law:
Initial potential energy:
.
Final potential energy:
.
The final potential energy is less negative than the initial one. In other words, the two particles gain energy in this process. The energy difference (final minus initial) will be equal to the work required to move them at a constant speed.
.
Ответ: