Question

1.
A charge Q is placed at each of the opposite
comers of a square. A charge q is placed at
each of the other two comers. If the net
electrical force on Q is zero, then Qlq equals​

Answer 1

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Here's your answer

In the given case,

q₁ = Q

q₂ = q

r = 1/2 of diagonal

 = a√2/2

Force due to Q on q = kq₁q₂/r²

F = kQq/(2a²/4)

F = 2kQq/a²

Since net force is 0,

2kQq/a² + 2kQq/a² = 0

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