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Question

One form of coulomb's law in electricity states that d=k square root q1q2  In the formula, d is the distance between two charged bodies, and q1 and q2 are the charges carried by the bodies. when q 1=1, d=5 cm, and k=4, Find q2.

Answer 1

d=k*root(q1*q2)

or d/k=root(q1*q20

q1*q2=(d/k)^2

so q2=(d/k)^2 /q1

d=5, k=4, q1=1

q2=(5/4)^2 /1

q2=(5/4)^2

=1/5725