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A charged paint is spread in a very thin uniform layer over the surface of a...

A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 12.0 cm , giving it a charge of -18.0 ?C .

Find the electric field just inside the paint layer.

Find the electric field just outside the paint layer.

Find the electric field 6.50 cm outside the surface of the paint layer.

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Answer #1

Ans: Given charge on non conducting spherical shell is Q= -18 C

Radius of the sphere is R= 0.06 m

a) The electric field inside the sphere is Zero because there is no charge present inside the sphere.

b) The electric field due to the shell is given by   , is the coloumb constant.

So, electric field just outside the sphere is , Here negative sign indicates the electric field is radially towards the sphere.

c) At r= 6 cm+6.5 cm= 0.125 m, the electric field is , Here negative sign indicates the electric field is radially towards the sphere.

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