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A spherical cloud of negatively charged particles carries a charge density that is modeled by: ρ=ρ0(1−r/R)...

A spherical cloud of negatively charged particles carries a charge density that is modeled by: ρ=ρ0(1−r/R)

Where ρ0 is the central density (which is 1.2 nC·m-3), R is the radius of the cloud (which is 2.9 m) and r is the distance from the centre of the cloud.

a) Determine the electric field at 1.2 m from the centre of the cloud: __________  N·C-1   

b) Determine the electric field at 4.1 m from the centre of the cloud: __________  N·C-1

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