Measurements indicate that there is an electric field surrounding the earth. its magnitude is about 150 n/c at the earth's surface and points inward toward the earth's center. what is the magnitude of the electric charge on the earth? express your answer using two significant figures.

The charge of earth is

Explanation:

Assuming earth as a spherical body we have

For a sphere of radius 'r' and charge 'q' the electric field generated at a distance 'r' form the center of sphere is given by the equation

where

'Q' is the total charge on sphere

Now at a distance 'r' equal to radius of earth(6371 km)  we have the electric field strength is 150N/C

Using the given values we obtain

Now since the electric field is inwards thus we conclude that this charge is negative in magnitude.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

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