An isolated insulating ball of radius carries the charge spread uniformly through its…

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electrostatic fields and potential · Electrostatic fields and potential

Electricity, Magnetism and Electromagnetism, Ch Electric flux and Gauss's law

Problem

An isolated insulating ball of radius R=0.12 mR = 0.12\,\mathrm{m} carries the charge Q=4.0 nCQ = 4.0\,\mathrm{nC} spread uniformly through its volume, fixed in place. Consider the fixed point PP at a distance 0.060 m0.060\,\mathrm{m} from the centre. ((a)) Find the field magnitude at PP. ((b)) The same charge is now squeezed, still uniformly, into a ball of radius 0.060 m0.060\,\mathrm{m} with the same centre. Find the new field magnitude at the same point PP. ((c)) By what factor has the field at PP changed?

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