Beatrice Lang
The motion of planets is influenced by gravity, not electric force, despite the latter being stronger. This is because astronomical bodies tend toward a near-neutral net electric charge, meaning the attraction to one type of charge and the repulsion from the opposite charge mostly cancel each other out. Gravity, on the other hand, always attracts and never repels. Additionally, plasmas, which make up 99.9% of the universe, are electrically neutral outside of their Debye length, resulting in stars appearing electrically neutral from the perspective of a planet.
| Characteristics | Values |
|---|---|
| Electric force doesn't affect planets | Because planets tend towards a near-neutral net electric charge |
| Electric force is stronger than gravity | Yes, but it tends to cancel itself out within large objects |
| Gravitational force | Always attractive, unlike electric forces which can be attractive or repulsive |
| Inverse relationship | Electric and magnetic field strengths follow an inverse cube relationship, unlike gravity which follows an inverse-square relationship |
| Plasma | Plasma is electrically neutral outside of its Debye length |
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What You'll Learn
- Electric force is stronger than gravity but cancels itself out within large objects
- Planets are electrically neutral and don't produce interesting electrical fields
- Gravitational force has an infinite range, unlike strong and weak interactions
- Gravity always attracts and never repels, unlike electric forces
- Electric force is not relevant for large celestial bodies like planets
Electric force is stronger than gravity but cancels itself out within large objects
Electric forces are much stronger than gravity, but they tend to cancel each other out within large objects, resulting in no net force. This is because electric charges can be positive or negative, and when they come together, they can cancel each other out, leading to a near-zero net charge on large scales. On the other hand, gravity always attracts and never repels, so there is no opportunity for cancellation.
The fundamental interactions or forces in nature are gravity, electromagnetism, weak interaction, and strong interaction. The gravitational and electromagnetic interactions produce long-range forces that can be observed in everyday life. The effects of gravity are more pronounced over large distances because electromagnetic effects tend to cancel out. This is because large objects adjust themselves to accommodate the stronger electromagnetic force, resulting in a neutralizing effect.
While electric forces are stronger than gravity, they do not significantly influence the motion of planets. This is because planets have essentially zero net charge. Space near stars contains tiny, subatomic charged particles, both positive and negative. A planet's charge fluctuates slightly, but if it gained a significant electrical charge, it would attract oppositely charged ions, reducing the net charge. Additionally, like charges repel each other, while gravity remains stable in large amounts as it does not repel itself.
The interstellar medium contains sparse plasma, which means that if planets had a significant charge, they would attract more oppositely charged ions, reducing their net charge. This is similar to how a highly negatively charged object will release electrons to become neutral, and a highly positively charged object will draw in electrons or explode. Planets are not in danger of accumulating enough charge to compete with gravity.
To summarise, electric forces are stronger than gravity but cancel out within large objects due to the presence of both positive and negative charges. Gravity, on the other hand, always attracts and does not repel, so it dominates over large distances. Planets maintain a near-zero net charge, preventing electric forces from influencing their motion significantly.
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Planets are electrically neutral and don't produce interesting electrical fields
Although the electromagnetic force is far stronger than gravity, it tends to cancel itself out within large objects. As a result, over large distances, gravity becomes the dominant force. This is because gravity always attracts and never repels, whereas astronomical bodies tend toward a near-neutral net electric charge. The attraction to one type of charge and the repulsion from the opposite charge mostly cancel each other out.
The sun has a strong magnetic field, but it isn't strong enough to dominate over gravitational effects unless you're in the solar atmosphere. Similarly, although all planets have their magnetic fields, they are not strong enough to overcome gravitational forces.
In high school physics, the movements of planets are calculated with gravity alone, and it is so accurate that we don't need to consider Einstein's relativity. Electrical force is much stronger than gravity, but it doesn't influence the movement of planets. This is because planets have zero charge, and so the electrical force has no influence.
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Gravitational force has an infinite range, unlike strong and weak interactions
There are four fundamental forces or interactions in nature: gravitational force, electromagnetism, weak interaction, and strong interaction. The gravitational force is the weakest of the four interactions at the atomic scale, but it is the most important force for astronomical objects over astronomical distances. This is because, firstly, gravitation has an infinite effective range, and secondly, gravity always attracts and never repels.
The weak force works on the smallest distance scales, another 1,000 times smaller than the strong force. It is about a million times weaker than the strong force but is still considerably stronger than gravity. The weak force is responsible for interactions between subatomic particles, such as protons, neutrons, and electrons. It can also change one quark type into another. The weak force and the electromagnetic force have been found to be linked at high energy or short range, and they can be described by one set of equations called the "electro-weak" theory.
The infinite range of gravitational force, along with its attractive nature, makes it responsible for holding together large-scale structures in the universe, such as planets, stars, and galaxies. The strength of the gravitational force approximately increases with the masses of the two objects but decreases with the square of the distance between them. This is in contrast to the electromagnetic force, which only comes into play for charged objects, and whether it attracts or repels depends on the charges of each.
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Gravity always attracts and never repels, unlike electric forces
There are four fundamental forces that shape the universe: gravity, electromagnetism, and strong and weak nuclear forces. Gravity is a force that acts between any two objects with mass. The pull of gravity is always attractive, and the strength of this force increases with the masses of the two objects but decreases with the square of the distance between them. This means that the pull of gravity between two very large objects, like planets, can have a significant effect on their motion, keeping our feet on the ground and holding Earth in orbit around the Sun.
Unlike gravity, electric forces only come into play for charged objects, and whether they attract or repel depends on the charges of each. Like charges repel, and opposite charges attract. While electromagnetism is stronger than gravity, in large objects, it is often balanced out by the presence of both positive and negative charges that form neutral atoms. For example, the Earth has a magnetic field due to electric currents in its liquid core, but the planet itself is electrically neutral.
The interstellar medium is full of sparse plasma, which means that if planets had a significant charge, they would attract more oppositely charged ions, reducing the net charge. However, planets do not have a significant electrical charge, and their charge drift is kept close enough to zero that it doesn't affect orbits. Therefore, the electric force does not influence the motion of planets.
In summary, gravity always attracts and never repels, unlike electric forces, which can either attract or repel depending on the charges of the objects involved. The predominance of gravity in shaping the movements of planets can be attributed to the electrically neutral nature of celestial bodies and the rapid drop-off in strength of electric forces with distance.
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Electric force is not relevant for large celestial bodies like planets
Although the electromagnetic force is far stronger than gravity, it tends to cancel itself out within large objects. Hence, over large (astronomical) distances, gravity tends to be the dominant force, and is responsible for holding together the large-scale structures in the universe, such as planets, stars, and galaxies. This is because astronomical bodies tend toward a near-neutral net electric charge, with equal numbers of protons and electrons, resulting in a net electric charge of zero.
Gravitation, one of the four fundamental forces, has an infinite effective range, similar to electromagnetism but unlike the strong and weak interactions. The gravitational interaction is attributed to the curvature of spacetime, as described by Einstein's general theory of relativity. It always attracts and never repels. In contrast, electric forces can be attractive or repulsive, and their field strengths around dipoles follow an inverse cube relationship, not inverse square, causing their strength to drop off more rapidly than gravity.
The sun has a strong magnetic field, but it isn't strong enough to dominate over gravitational effects unless you're in the solar atmosphere. Similarly, planets are in no danger of accumulating enough charge to compete with gravity. If a planet gained a significant electrical charge, it would repel like charges and attract opposite charges, until the net charge became close to zero again.
In high school physics, the movements of planets are calculated with gravity alone, and it is so accurate that we don't need to consider Einstein's relativity. The same is true for the motions of electrons, where we calculate orbit time and speed without considering electric force.
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Frequently asked questions
Electric force does not affect planets because astronomical bodies tend towards a near-neutral net electric charge. This means that the attraction to one type of charge and the repulsion from the opposite type of charge cancel each other out.
While 99.9% of the universe is plasma, plasma is electrically neutral outside of its Debye length. This means that from the perspective of a planet, a star is electrically neutral and does not produce an interesting electrical field at a distance.
While electric forces are far stronger than gravitational forces, they tend to cancel themselves out within large objects. Therefore, over large (astronomical) distances, gravity tends to be the dominant force.
Planets have a net electric charge of zero because they contain equal numbers of protons and electrons. Therefore, electric force does not influence the motion of planets.
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