Question

A point charge Q is placed at the midpoint of a line joining two charges 4q and q if the net force on charge q is zero then Q must be equa to

Answer 1

Answer:

Q=q

What is point charge?

• An electrical charge is a point charge.
• when linear sized charge are smaller than distance between them their sized perhaps ignored and the charged bodies are known as point charge

what is net force?

• The sum of all forces acting on an object is the net force.
• The net force is calculated by Newton's second law that is F=ma
• where F is the net force and m is the mass of the object.

Explanation:

Given:- q1 = 4 q2 = q

To find:- Net force on Q

Formula:- F = Kq1q2/r^2

where K=9*10^9

Solution:- = K4q*q/4a^2

                 =Kq^2/a^2

   now

  F13=F14

 KQ^2/a^2=Kq^2/a^2

  Q=q

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