Homework Answers
A) potential by charge Q is V =kQ/(r)
Where k=coulomb constant
B) work needed w = q*V =k*Q*2Q/r
C) from conservation of momentum
Intial total momentum =final total momentum
=> 0= m*v+m*V
=> v & V are equal in magnitude and opposite in direction
From conservation of energy
Electric P.E = K.E1+K.E2
=> k*Q*2Q/r = 2*1/2*m*v^2
=>v^2=2*k*Q^2/m =>v=sqrt (2*k*Q^2/m)
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