20cm = 0,2m
\begin{lgathered}F = \dfrac{k \cdot |Q| \cdot |q|}{d^{2}} \\\\ F = \dfrac{k \cdot |Q| \cdot |q|}{(0,2)^{2}} \\\\ \boxed{F = \dfrac{k \cdot |Q| \cdot |q|}{0,04}} \\\\\\ F' = \dfrac{F}{4} \\\\ \dfrac{k \cdot |Q| \cdot |q|}{d'^{2}} = \dfrac{\dfrac{k \cdot |Q| \cdot |q|}{0,04}}{4} \\\\ \dfrac{k \cdot |Q| \cdot |q|}{d'^{2}} = \dfrac{k \cdot |Q| \cdot |q|}{0,16} \\\\ d'^{2} = 0,16 \\\\ d' = \sqrt{0,16} \\\\ d' = 0,40m \\\\ \boxed{\boxed{d' = 40cm}}\end{lgathered}
F=
d
2
k⋅∣Q∣⋅∣q∣
(0,2)
0,04
F
′
=
4
′2
0,16
=0,16
=0,40m
=40cm
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20cm = 0,2m
\begin{lgathered}F = \dfrac{k \cdot |Q| \cdot |q|}{d^{2}} \\\\ F = \dfrac{k \cdot |Q| \cdot |q|}{(0,2)^{2}} \\\\ \boxed{F = \dfrac{k \cdot |Q| \cdot |q|}{0,04}} \\\\\\ F' = \dfrac{F}{4} \\\\ \dfrac{k \cdot |Q| \cdot |q|}{d'^{2}} = \dfrac{\dfrac{k \cdot |Q| \cdot |q|}{0,04}}{4} \\\\ \dfrac{k \cdot |Q| \cdot |q|}{d'^{2}} = \dfrac{k \cdot |Q| \cdot |q|}{0,16} \\\\ d'^{2} = 0,16 \\\\ d' = \sqrt{0,16} \\\\ d' = 0,40m \\\\ \boxed{\boxed{d' = 40cm}}\end{lgathered}
F=
d
2
k⋅∣Q∣⋅∣q∣
F=
(0,2)
2
k⋅∣Q∣⋅∣q∣
F=
0,04
k⋅∣Q∣⋅∣q∣
F
′
=
4
F
d
′2
k⋅∣Q∣⋅∣q∣
=
4
0,04
k⋅∣Q∣⋅∣q∣
d
′2
k⋅∣Q∣⋅∣q∣
=
0,16
k⋅∣Q∣⋅∣q∣
d
′2
=0,16
d
′
=
0,16
d
′
=0,40m
d
′
=40cm