Homework Answers
It will accelerate to the right because when two equal charges of same polarity put together then they repel each other . Since there are six charges two are left side and 3 are right side of the fourth electron. 5th and 3rd electron cancel out their effect of repulsion and same for 6th and 2nd but there is 1st electron because of which some repulsion takes place in 4rth electron and the direction of repulsion should be right.
So option a is correct one.
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