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Q.

The distance between the two charges 25 μC and 36 μC is 11 cm.  At what point on the line joining the two, the intensity will be zero 

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a

At a distance of 5 cm from 25 μC

b

At a distance of 5 cm from 36 μC

c

At a distance of 10 cm from  25 μC

d

At a distance of 11 cm from 36 μC

answer is A.

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Detailed Solution

Suppose electric field is zero at point N in the figure then 

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At NE1=E2

which gives x1=xQ2Q1+1=113625+1=5cm

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