please solve these questions......
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2) Calculate the force on charge Q
FQ = kQ²/r² and Fq = kQq/(r/2)² = 4kQq/r²
For equilibrium,
FQ + Fq = 0
FQ = -Fq
kQ²/r² = - 4kQq/r²
Q = - 4q
q = - Q/4