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Which of the following statements describe both the gravitational field AND the electrical field due to a proton?

The following is some information that may be helpful when selecting the appropriate choice:

  • The mass of a proton is $1.67\times10^{-27}\text{ kg}$ and the charge of a proton is $1.6\times10^{-19}\text{ C}$.
  • The Universal Gravitational constant, $G$, is $\ \mathrm{6.67\times10^{-11}\text{ m}^3/kg\text{ s}^2}$.
  • Coulomb's constant, $k$, is $\ \mathrm{9.0\times10^9\text{ N}\text{ m}^2/C^2}$.
A

When the distance from the center of the proton, initially greater than the radius of the proton, is doubled, the magnitude of the field is decreased to one-fourth of its initial value.

B

The direction of the field is toward the center of the proton.

C

The field is radial and varies inversely with the distance from the center of the proton for distances greater than the radius of the proton.

D

The force due to the gravitational field is significantly greater than the force due to the electric field on a second proton that is placed at a distance equal to three times the first proton's radius.

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