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Two particles A and B having charges 8....

Two particles A and B having charges ` 8.0 xx 10 ^(-6) C` and `-2.0 xx 10(-6) C` respectively are held fixed with a. separtion of 20cm. Where should a thired charged. particle be placed so that it dose not experience a net electric force?.

A

5 cm right of B

B

5cm left of A

C

20 cm left of A

D

20 cm right of B

Text Solution

Verified by Experts

The correct Answer is:
D

Let the third charge Q be placed at a distance x to right of B. Then
`(kQxx8xx10^(-6))/((20+x)^(2))=(kQ(2xx10^(-6)))/(x^2)`
or x=20 cm.
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