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can you explain that to me ?

Two electric charges are placed on the x=axis. On
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Answer #1

I think you are asking the explanation of part c and d.

1.2S 0 8从c 从

I have shown direction of electric field due to q1 and q2 charges.

To the left of q1, electric field will be pointed towards left due to q1 and right due to q2.
But magnitude of q1 is large so E1 dominate and E will never be 0

Between q1, electric field will be pointed towards right due to q1 and q2 .
But magnitude of q1 is large so E1 dominate and E will never be 0

To the right of q2, since distance from q1 increases it effect will decrease. Also its electric field direction is opposite to q2.So there is a chance that at some point E will become 0. At that point there won't be any force acting on q3.
So answer is To the right of q2

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