-The potential of an object is actually given as a reference from another point,

Question

-The potential of an object is actually given as a reference from another point, so typically the potential of the Earth is said to be zero so that all other potentials are positive from this point

-Given in the equation, we know that when R=, VE=0, therefore any radius that is closer to the charge point would produce a potential that is negative

-The fact that the potential of the earth when zero is at infinity is a negative value is also known as the net charge of the Earth (Q=-9.04*105C) is a negative number

-Substituting in the values known into the equation, the potential is found to be -1.28*109V

Explanation / Answer

Electric field E = 200 N / C Radius of earth R = 6371 km                             = 6371000 m We know E = Kq / R 2 From this charge q = ER 2 / K Where K = Coulomb's constant                 = 8.98755 x 10 9 N m 2 / C 2 Subsitute values we get q = 903.241 x 10 3 C E is directed downward.So, q is negative. q = -903.241 x 10 3 C So,Electric potential at the surface of the earth V = Kq / R                                                                            = 1.275 x 10 9 volt                                                                            ~ 1.28 x 10 9 volt                                                                            = 1.275 x 10 9 volt                                                                            ~ 1.28 x 10 9 volt Yes your solution is correct

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