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physics, help!!

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A metallic sphere initially has a net charge of +4.0 nC. A negatively-charged rod initially has a net charge
of –6.0 nC. When the rod touches the sphere 8.2 x109 electrons are transferred to the sphere. What is the
new net charge on the sphere?

  • physics, help!! -

    q = Ne=- (8.2•10⁹•1.6•10⁻ ¹⁹)=
    =- 1.36•10⁻⁹ C.
    q(sph)+q =4•10⁻⁹ - 1.36•10⁻⁹ = + 2.64•10⁻⁹ C

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