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Q.

A point charge of 10 μC is placed at the origin. At what location on the X-axis should a point charge of 40 μC be placed so that the net electric field is zero at x = 2cm on the X-axis?

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a

x=- 4cm

b

x= 8cm

c

x=6 cm

d

x=4 cm

answer is B.

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Detailed Solution

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Null point distance x=dq2q1+12=d4010+1=d3⇒d=6cm

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