Asked by Barry

The electric field E at a distance r from a point field is E =K/r^2

where k is a constant. Find an
expression for the instantaneous rate of change of the electric field with respect to r.

Answers

Answered by Steve
another way to write that is

E = Kr^-2
so, using the power rule,
dE/dr = K(-2r^-3) = -2K/r^3
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