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Electricity and Magnetism Level 2

Four point charges q 1 q_1 , q 2 q_2 , q 3 q_3 and q 4 q_4 with charges 1C, 2C, 3C, 4C \text{1C, 2C, 3C, 4C} are placed at coordinates (0,0,0) , (1,0,0), (0,1,0) and (0,0,1) respectively.

Assuming one unit equal to one meter, find ∑ F i ⃗ \sum \vec{F_{i}} , where F i ⃗ \vec{F_{i}} represents force on one due to rest three.


The answer is 0.

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Kushal Patankar by Kushal Patankar , 22, India

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1 solution

Newton's Third Law. In Σ F i \Sigma F_i , there will be totally even number of terms and we can find pairs which will cancel each other.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Σ F i \Sigma F_i represents total internal force which is always zero.

Kushal Patankar - 6 years, 1 month ago

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