Answer: Force will be approxmately 4.82 Newtons
Step-by-step explanation:
Step 1
letThe force, F, acting on a charged object which varies inversely to the square of its distance, r, from another charged be given as
F ∝ I / r²
introducing the proportionality of constant,K we have
F ∝ I / r²
F =K I / r²
F= K/ r²
when the distance= 0.72, and force is 6.4 N, K will be
F= K/ r²
6.4N = K/ 0.72²
K= 6.4 X 0.72²
K=3.31776
step 2
when distance = 0.83, Force becomes
F= K/ r²
F= 3.31776/ 0.83²
F=4.82 Newtons
