A 11.5 nC charge is at x = 0cm and a -1.2 nC charge is at x = 3 cm ..At what position or positions on the x-axis is the electric field zero?

Explanation:

Given

charge is placed at

another charge of is at

We know that Electric field due to positive charge is away  from it and Electric field due to negative charge is towards it.

so net electric field is zero somewhere beyond negatively charged particle

Electric Field due to at some distance r from it

Now Electric Field due to is

Now

thus

Thus Electric field is zero at some distance r=1.43 cm right of

answer:

an example of solubility is salt or sugar dissolving in water.

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