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An electrostatic field line leaves at an...

An electrostatic field line leaves at angle `alpha` from charge `q_(1)` and connects with point charge `-q_(2)` at angle `beta` (see figure).

then find the relationship between `alpha` and `beta` :

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The correct Answer is:
`q_(1) "sin"^(2) alpha/2=q_(2) "sin"^(2) beta/2`
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