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Find the total force on charge q due to ...

Find the total force on charge q due to a charge rod having linear charge density `lamda C/m` placed as shown in figure.

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force `F=intdF=int_(a)^(a+l)(kq'lamda.dx)/(x^(2))=kqlamda[-1/x]_(a)^(a+l)`
`=kqlamda[1/a-1/(a+l)]`
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