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Q.

Two point charges + I q and -2 q are located at x = 0 and x = 1 respectively. The location of a point on the X-axis at which the net electric field due to these two point charges is zero is

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a

L/4

b

2 L

c

4 L

d

8 L

answer is B.

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Detailed Solution

Let the electric field be zero at a distance d from x = o as shown in fig.The electric field E at O is given byE=14πε0⋅8qd2+14πε0(−2q)(L−d)2 or 8d2=2(L−d)2Solving, we get d = 2L

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