Point on the line of two charges where the field (or the force on a third charge) is zero

1. A.
   At $5\text{ }cm$ from $20\mu C$ on the left side of system
2. B.
   At $5\text{ }cm$ from $- 5\mu C$ on the right side
3. C.
   At $1.25\text{ }cm$ from $- 5\mu C$ between two charges
4. D.
   At midpoint between two charges

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1. A.
   $x = - 4\text{ }cm$
2. B.
   $x = 6\text{ }cm$
3. C.
   $x = 4\text{ }cm$
4. D.
   $x = 8\text{ }cm$

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1. A.
   $\frac{(1 + \sqrt{3})}{r}$
2. B.
   $\frac{r}{3(1 + \sqrt{3})}$
3. C.
   $\frac{r}{(1 + \sqrt{3})}$
4. D.
   $r(1 + \sqrt{3})$

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1. A.
   $(4\text{ }d/3,0,0)$
2. B.
   $(d/4,0,0)$
3. C.
   $(3\text{ }d/4,0,0)$
4. D.
   $(d/3,0,0)$

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