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March 30, 2015

Homework Help: phy

Posted by Yuni on Saturday, December 31, 2011 at 9:36pm.

potential difference=40v b2n plate A & B.
find work done if q=+3C from
a) B to A
b) A to B

*i already know the ans but i need the explanation for the formula.

-this is my work
a)w=-qv b)-120J
=-3(-40)
=120 J

what i want to ask is:
1-why must we add - sign for v is not that if the v is against electric field is +?

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