Coulomb force in a dielectric medium compared with air

1. A.
   $\frac{1}{\sqrt{k}}$
2. B.
   $\sqrt{k}$
3. C.
   $\frac{\sqrt{k}}{2}$
4. D.
   $2\sqrt{k}$

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1. A.
   $5F$
2. B.
   $\frac{F}{3}$
3. C.
   $\frac{F}{4}$
4. D.
   $\frac{F}{5}$

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1. A.
   $d[k]^{1/2}$
2. B.
   $k[d]^{1/2}$
3. C.
   $1.5d[k]^{1/2}$
4. D.
   $2d[k]^{1/2}$

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1. A.
   $\dfrac{d}{\sqrt{K}}$
2. B.
   $d\sqrt{K}$
3. C.
   $d^2K$
4. D.
   $\dfrac{K}{d^2}$

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1. A.
   $R_1 = \sqrt{K}R$
2. B.
   $R_1 = R$
3. C.
   $R_1 = \dfrac{R}{K}$
4. D.
   $R_1 = \dfrac{R}{\sqrt{K}}$

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1. A.
   $r$
2. B.
   $\dfrac{r}{K}$
3. C.
   $\dfrac{r}{\sqrt{K}}$
4. D.
   $r\sqrt{K}$

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