A planetary probe is a spacecraft carrying instruments intended to explore the
physical properties of outer space or celestial bodies other than Earth.
Consider a planetary probe travelling inward towards the center of a planet. At 600 m
above the surface of the planet, the electric eld generated by the planet is directed
up and has the magnitude of 180 N/C. At 500 m above the surface, the direction of
the electric eld remains the same, but the magnitude is 125 N/C.
Identify the nature of the source charge and magnitude of the charge density in the
region described above.
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