Electric Charges and Fields - Result Question 6

6. A charge ’ q ’ is placed at the centre of the line joining two equal charges ’ Q ‘. The system of the three charges will be in equilibrium if ’ q ’ is equal to

[NEET Kar. 2013, 1995]

(a) Q/2

(b) Q/4

(c) Q/4

(d) Q/2

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Answer:

Correct Answer: 6. (b)

Solution:

  1. (b) The system of three charges will be in equilibrium.

For this, force between charge at A and B+ force between charge at point O and either at A or B is zero.

i.e., KQ2(2r)2+KQq(r)2=0

By solving we get,

q=Q4.



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