Question

In the figure, if net force on Q is zero then value of Q/ q is

Answer 1

Answer:

0

Explanation:

because if net force is 0 ,then value is also be 0.

Answer 2

(The missing diagra in the question  is attached below in the answer)

Given :

Length of the side of a square = r

To Find :

The value of the ratio Q/q from the given data = ?

Solution :

• The  net force acting on Q is zero, so the charges Q and q should be of opposite sign.

• Let Q be of positive sign and q be of negative sign.we know that the like charges repel each other and unlike charges attract each other.

• Net force on Q = Force due to  q - Force due to  Q
• Force due to  q = Force due to  Q  

          $\sqrt{(\frac{kQq}{r^{2} } )^{2}+ (\frac{kQq}{r^{2} } )^{2}} = {\frac{kQQ}{(\sqrt{2r})^{2} } }$

          $\sqrt{2(\frac{kQq}{r^{2} } )^{2}} = {\frac{kQQ}{(\sqrt{2r})^{2} } }$

          $\sqrt{2} \times \frac{kQq}{r^{2}}=\frac{kqQ}{2r^{2} }$

          $2\sqrt{2}Qq = Q^{2}$

           $\frac{Q}{q} =2\sqrt{2}$

      The value of the ratio Q/q is 2√2