Two small, irregularly shaped conducting objects, one carrying charge \(+q\) and one carrying charge \(-q\), are placed on an \(x\) axis at \(x=-4.0 \mathrm{~m}\) and \(x=+4.0 \mathrm{~m}\), respectively. Between the objects, the electric field on the \(x\) axis is given by \(E(x)=a q\left(x^{2}+b\right)\), where \(a\) and \(b\) are constants.

(a) What are the standard units of \(a\) and \(b\) ?

(b) What is the capacitance of this configuration?