Concerning E= keq/r^2, if r is tripled what happens to the electric field genera

Question

Concerning E= keq/r^2, if r is tripled what happens to the electric field generated by that point charge? a) decreases by a factor of 3 b)becomes 3times stronger c) becomes 9 times stronger d) only 1/9 as strong as originally. Concerning E= keq/r^2, if r is tripled what happens to the electric field generated by that point charge? a) decreases by a factor of 3 b)becomes 3times stronger c) becomes 9 times stronger d) only 1/9 as strong as originally. a) decreases by a factor of 3 b)becomes 3times stronger c) becomes 9 times stronger d) only 1/9 as strong as originally.

Explanation / Answer

Electric Field due to a point charge q is given by E = Kq/r^2

where r is the distance

so here if, r is tripled,

Enwe = Kq./(3r)^2

Enew = Kq^2/9r

Enwe = E/9

so E becomes 1/9 time

so option d is correct

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