Solve the following :

Question:

The sum of all electromagnetic forces between different particles of a system of charged particles is zero

  1. only if all the particles are positively charged

     

  2. only if all the particles are negatively charged

  3. only if half the particles are positively charged half are negatively charged

  4.  irrespective of the signs of the charges

Correct Option: 4

Solution:

 irrespective of the signs of the charges

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