A conducting sphere is placed within a conducting spherical shell as shown in th

Question

A conducting sphere is placed within a conducting spherical shell as shown in the figure below. The conductors are in electrostatic equilibrium. The inner sphere has a radius of 1.50 cm, the inner radius of the spherical shell is 2.25 cm, and the outer radius of the shell is 2.75 cm. The inner sphere has a charge of215nC, and the spherical shell has zero net charge.

A.) What is the magnitude of the electric field at a point 1.75 cm from the center?
B.)What is the electric field magnitude at a point 2.50 cm from the center? [Hint:What must be true about the electric field inside a conductor in electrostatic equilibrium?]
C.) What is the electric field magnitude at a point3.40cm from the center?

Explanation / Answer

a. 9x10^-9 x 215nC/ (1.75)^2 x 10^-4=631.88*10^-5 b. Zero c. 9x10^-9 x 215nC/ (3.40)^2 x 10^-4=167.4*19^-5

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