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## Homework Statement

A cylindrical piece of insulating material is placed in an external electric field, as shown in the figure. The net electric flux passing through the surface of the cylinder is

a.positive.

b.negative.

c.zero.

Figure : http://i131.photobucket.com/albums/p289/SoaringCrane/Tip23_fig11.gif

## Homework Equations

Possibly: electric flux = E*A*cos theta

## The Attempt at a Solution

I’m really unsure about this question. Would the net flux be a. positive? The flux on the ends would be 0 because the E and dA vectors are perpendicular to each other while the flux on the wall near the middle will be positive since E and dA are parallel to each other???

## Homework Statement

The electric field at the surface of a conductor

a.is parallel to the surface.

b.depends only on the total charge on the conductor.

c.depends only on the area of the conductor.

d.depends only on the curvature of the surface.

e.depends on the area and curvature of the conductor and on its charge.

## Homework Equations

This is really a conceptual question. Possibly electric flux = integral[E*dA] = Q_enclosed/epsilon_0

## The Attempt at a Solution

Is the correct choice e. depends on the area and curvature of the conductor and on its charge? I know that the electric field intensity increases as the curvature increases. The electric field for an infinitely long sheet is based on the surface charge density, so area and charge (from Gauss’ law) are other factors?

Thanks.