A solid metal ball of radius 1.4 cm bearing a charge of - 18 nC is located near

Question

A solid metal ball of radius 1.4 cm bearing a charge of -18 nC is located near a hollow plastic ball of radius 2.2 cm bearing a uniformly distributed charge of -9 nC (see the figure) on its outer surface. The distance between the centers of the balls is 7 cm.

A solid metal ball of radius 1.4 cm bearing a charge of -18 nC is located near a hollow plastic ball of radius 2.2 cm bearing a uniformly distributed charge of -9 nC (see the figure) on its outer surface. The distance between the centers of the balls is 7 cm. Assume the +x axis runs to the right, the +y axis runs up and the +z axis is out. What is the electric field at the center of the metal ball due only to the charges on the plastic ball? What is the net electric field at the center of the metal ball? What is the electric field at the center of the metal ball due only to the charges on the surface of the metal ball?

Explanation / Answer

0

In a static situation such as this, ie where there is no current, the electric field in any conductor is zero.

if there was an electric field in the metal, the electrons in the metal would feel the force and move. They tend to move in the direction that cancels the field. And reason suggests that they would continue to move until there was no more field.

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