There are three charges, each with the same magnitude but with the signs indicat

Question

There are three charges, each with the same magnitude but with the signs indicated, arranged on a (dotted) line, as shown in the figure below. In which region or regions along the line will you find at least one point at which the total electric field is zero? Circle the numeral corresponding to each correct region. (Consider regions I and IV to extend very far away, but not out to infinity; that is, the E field should vanish at some point before you "reach" a distance of infinity in order for you to choose I and/or IV in your answer.)

Explanation / Answer

I here positive side direction is away from them and negative sign direction towards the charge

II

IV here positive charge direction away the charges and negative charge in towards charge

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