# Physics

posted by .

On a clear day, the Earth’s atmospheric electric field near the ground has a magnitude of 100 N/C and points vertically down. Inside the ground, the electric field is zero, since the ground is a conductor. Consider a mathematical box of 1.0 m x 1.0 m x 1.0 m, half below the ground and half above. What is the electric flux through the sides of the box? What is the charge enclosed by the box?

• Physics -

Use Gauss' Law. Assume there is no flux in the downward direction or out the sides. The flux through the top (E* 1 m^2) will be proportional to the charge inside the box. Look up the law for the poprtionality constant.

That charge will reside at the surface, since the groud is a conductor.

## Similar Questions

1. ### electrc field inside charged solid

how can electric field exist inside a uniform charge solid... when by gauss law electric field is zero inside a conductor
2. ### physics

a thin wire with linear charge density _ is surrounded by a conducting cylindrical shell. (a) If the electric field must be zero inside a conductor, is the electric field due to the wire shielded from extending beyond the conducting …
3. ### physics

please check: Two point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the resulting electric and gravitational forces between them change?
4. ### Physics

The Earth is surrounded by an electric field on its surface that points toward the center of the Earth with an average magnitude of 150 N/C. If there is an electron that is released in vacuum at the Earth’s surface, what will the …
5. ### Physics

3 There are two charges +Q and –Q/2 that locate at two positions with a separation of d as shown in Fig. 1. We may put +Q at the origin of the x-axis to facilitate the calculation. (a) Find the electric field for +Q and –Q/2 at …
6. ### Physics

On a clear, sunny day, a vertical electrical field of about 118 N/C points down over flat ground. What is the surface charge density on the ground for these conditions?
7. ### Physics

There is a very large horizontal conducting plate in the plane (consider it infinitely large). Its thickness is . The charge densities on the upper and the lower surfaces are both equal to . The goal of this problem is to find the …
8. ### Physics

A point charge Q1=-2 microcoulomb is located at x=0, and a point charge Q2=+8 microcoulomb, is placed at x=-0.5 on the x axis of a cartesian coordinate system.The goal of this problem is to determine the electric field,at various points …
9. ### Physics

Lighting strike: Storm clouds build up large negative charges that dwell in a charge center. Suppose a storm cloud has -25 C in a charge center located 10 km above the ground. The negative charge center attracts an equal amount of …
10. ### Physics

A vertical wall (5.3 m multiplied by 2.3 m) in a house faces due east. A uniform electric field has a magnitude of 157 N/C. This field is parallel to the ground and points 38° north of east. What is the electric flux through the wall?

More Similar Questions