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Question1

At what distance from a proton is the magnitude of its electric field 2.3×105?

What is magnitude of the electric field at a point 0.65 away from a point charge of +7.0?

Two depressing point charges are separated by 9.00and feel a mutual repulsive force of 1.75.

The charge of one is three times that of the other.

A) How much charge does each have?

B) What would be the force if the total charge were instead regularly distributed on both point charges?

Question2

The fact that galaxies beyond away are moving away from us the fastest is taken as facts that-

a. we are at center of the universe

b. most distant galaxies have a blue shift

c. those galaxies got farther from us as they were moving faster

d. universe is expanding

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