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Q.

The figure shows two point charges 2Q(>0) and -Q. The charges divide the line joining them in three parts I, II, and III.

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a

Region III has a local maxima of electric field.

b

Region I has a local minima of electric field.

c

Equilibrium position for a test charge lies in region II.

d

The equilibrium (if there is any) is stable for A negative test charge.

answer is A.

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Detailed Solution

Electric field is zero only at a point in region III. Equilibrium at this point will be stable for a negative charge.
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