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Two conducting objects one with charge o...

Two conducting objects one with charge of `+Q` and another with `-Q` are kept on `x`-axis at `x=-3` and `x=+4` respectively. The electric field on the `x`-axis is given by `3Q(x^(2)+4/3)`. What is the capacitance `C` of this configuration of objects?

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The correct Answer is:
`8.4mF`
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