Value of a charge that makes the net force on another charge zero

1. A.
   $-\frac{Q}{4}$
2. B.
   $\frac{Q}{2}$
3. C.
   $-\frac{Q}{2}$
4. D.
   $\frac{Q}{4}$

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

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1. A.
   $\frac{Q}{3}$
2. B.
   $-\frac{Q}{3}$
3. C.
   $\frac{4}{3}Q$
4. D.
   $-\frac{4}{3}Q$

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1. A.
   $\dfrac{+q}{4}$
2. B.
   $\dfrac{+q}{2}$
3. C.
   $\dfrac{-q}{2}$
4. D.
   $\dfrac{-q}{4}$

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1. A.
   $\dfrac{-Q}{2}$
2. B.
   $\dfrac{-Q}{4}$
3. C.
   $\dfrac{Q}{4}$
4. D.
   $\dfrac{Q}{2}$

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