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A point particle that has a charge of +11.1 nC is at the origin. (a) What is (are) the shapes of the equipotential surfaces in the region around this charge? (b) Assuming the potential to be zero at

`r=\infty `

, calculate the radii of the five surfaces that have potentials equal to

`20.0V,40.0V,60.0V`

, 80.0 V and 100.0 V , and sketch them to scale centered on the charge. (c) Are these surfaces equally spaced? Explain your answer. (d) Estimate the electric field strength between the

`40.0-V`

and

`60.0-V`

equipotential surfaces by dividing the difference between the two potentials by the difference between the two radii. Compare this estimate to the exact value at the location midway between these two surfaces.