physic

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DR.BOB Help me!!!!!!!!!
The electric field at a distance of 0.4m from a point charge q is 20.0N/C. Find the charge “q"

  • physic -

    E=kq/r^2
    q=E•r^2/k=20•0.16/9•10^9=0.36•10^-9 C= 0.36 nC

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