For a point charge, how does the potential vary with distance from the point charge, r?.
1 answer:
For a point charge, The potential varies inversely with distance from the point charge r, that is Potential V ∝
A point charge is defined as a charge that neither has mass nor volume, that is it exists as a single point.
The point charge with respect to the electric potential should be expressed in
V = KQ/r
Here we can say that the electric potential should be varied oppositely to the distance
Electric potential is defined as the amount of work needed to bring a charge from infinity to a certain place in opposition to electrostatic force. Only when there is a potential gradient at the conductor's ends do electrons travel across it.
Refer to more about potential here
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Answer:
D. The moon is closer to Earth than the sun.
Explanation:
Tides are formed as a consequence of the differentiation of gravity due to the moon across to the Earth sphere.
Since gravity variate with the distance:
(1)
Where m1 and m2 are the masses of the two objects that are interacting and r is the distance
For example, see the image below, point A is closer to the moon than point b and at the same time the center of mass of the Earth will feel more attracted to the moon than point B. Therefore, that creates a tidal bulge in point A and point B.
The Sun tidal force contributes to the tidal force of the moon over the earth making high tides higher and low tides lower.
However, even when the sun is more massive than the moon, it is farther away from the Earth than the moon. So, it is clear by equation 1 that the moon's gravity has a greater effect on Earth's oceans than the sun's gravity.
