Molly Ayala
Electric and magnetic forces are two different fundamental forces of nature. They are components of the electromagnetic field and their effects, as defined in the Lorentz force equation, are very different. Electric forces act on static charges, while magnetic forces act on moving charges. Electric forces are the result of the separation of positively and negatively charged particles, whereas magnets are not charged. Magnetic forces are induced by the motion of charges and act on currents of neutralized charges.
| Characteristics | Values |
|---|---|
| Sources of electric force | Electric charges |
| Sources of magnetic force | Moving electric charges |
| Electric force acts on | Static charge |
| Magnetic force acts on | Moving charge |
| Electric force formula | F=qE |
| Magnetic force formula | F= q (v X B) |
| Electric force dependence | Independent of charge's velocity and direction |
| Magnetic force dependence | Created perpendicular to the charge's direction |
| Electric force interaction | Between two charges |
| Magnetic force interaction | Between currents of neutralized charges |
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What You'll Learn
Electric forces act on static charges
The electric force is distinct from gravity in two ways. Firstly, if there are two neutrally-charged particles, there is no force observed, so it cannot be their masses that cause the force. Secondly, in addition to an attractive force, there is also a repulsive force, which is not seen with gravity. This suggests that there must be two different types of quantities responsible for the force. Gravity has only one type—mass—but electric force has two different types of "mass", which we refer to as electric charge. The units for this quantity are named after the scientist who first explored the force, Coulombs (C).
The magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them. The force is along the straight line joining them. If the two charges have the same sign, the electrostatic force between them is repulsive; if they have different signs, the force between them is attractive.
Sources of electric force are electric charges, while sources of magnetic force are moving electric charges (conductors, for instance). Electric forces act between charged bodies (charges), while magnetic forces act between magnetized bodies (magnets) or currents of neutralized charges.
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Magnetic forces act on moving charges
Electric forces and magnetic forces are two different aspects of electromagnetism. Electric forces are the result of the separation of positively and negatively charged particles. Sources of electric force are electric charges. On the other hand, magnetic forces are induced by the motion of electric charges. Sources of magnetic force are moving electric charges.
The force on a moving charge can be calculated using the right-hand rule. If the thumb of the right hand points in the direction of the charge's velocity, and the fingers point in the direction of the magnetic field, then the force on the charge is perpendicular and away from the palm for a positive charge, and perpendicular and into the palm for a negative charge.
Magnetic forces can cause charged particles to move in a circular or spiral path. The radius of the path can be used to calculate the mass, charge, and energy of the particle. This principle is used in various applications, such as keeping protons in a circular path in particle accelerators and deflecting cosmic rays approaching Earth.
In summary, magnetic forces act on moving charges and can cause them to move in a circular or spiral path. The direction and speed of the charge can be determined using the right-hand rule, and the properties of the charge can be calculated using the radius of the path.
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Magnets are not charged
While magnets and electricity share similarities, they are fundamentally different. Both electric and magnetic forces can attract and repel, but the mechanisms behind these interactions differ. Electric forces are the result of the separation of positively and negatively charged particles, whereas magnets are not charged. Instead, the force between magnets is due to the alignment of the atoms within the magnet.
The magnetic field, or B-field, describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. It is produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. The magnetic field vector B can be defined as the vector that, when used in the Lorentz force law, correctly predicts the force on a charged particle at a given point.
The magnetic field is an intrinsic property of the way the atoms are aligned within a magnet. Each atom within the magnet can be considered a mini magnet. When these atoms are aligned together, their combined effect is strong enough to reach out beyond their immediate location, creating a magnetic field. This magnetic field exerts a force on any charged particle within it that is perpendicular to both the motion of the charge and the force it experiences.
Magnets do not have a charge that is used up by being magnetic. While magnets can slowly lose their magnetism over time due to entropy, this is unrelated to how many things they have attracted or repelled.
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Electric forces are independent of charge velocity
Electric and magnetic forces are two different aspects of electromagnetism. Electric forces are the result of the separation of positively and negatively charged particles. These forces act between charged bodies, or charges.
Magnetic forces, on the other hand, are induced by the motion of charges. They are the result of moving electric fields. Sources of electric force are electric charges, and sources of magnetic force are moving electric charges.
While magnetic fields can exert a force on an electric charge, it can only do so if the charge is moving. The force due to a magnetic field on a charge increases with an increase in charge velocity. However, the force due to an electric field on a charge is independent of the charge's velocity. This means that the force can do work and give energy to the charge.
The Lorentz force equation fully characterizes electromagnetic forces on stationary and moving charges. The Lorentz force is the combination of electric and magnetic force on a point charge due to electromagnetic fields. The force on a charge due to an electric field always acts either parallel or antiparallel to the electric field. This is true regardless of the velocity of the charge.
In conclusion, electric forces are independent of charge velocity. This is in contrast to magnetic forces, which are induced by the motion of charges and depend on the velocity of the charge.
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Magnetic forces are created perpendicular to the charge's direction
Electric forces act between charged bodies, while magnetic forces act between magnetized bodies or currents of neutralized charges. Electric forces are the result of the separation of positively and negatively charged particles. In contrast, magnets are not charged; the force between magnets is due to the alignment of atoms within the magnet.
Magnetic forces are induced by the motion of charges and are always normal to the direction of the velocity of the charge they act upon. This means that magnetic forces are created perpendicular to the charge's direction. The Lorentz force, or magnetic force, is proportional to v × B, where v is the particle velocity and B is the magnetic field. As the vector cross-product is always at right angles to each of the vector factors, the force is perpendicular to v.
The force F exerted by a magnetic field on a charge q moving with velocity v is given by F = qv × B. F is perpendicular to the direction of the magnetic field B and the direction of the velocity v. F is also perpendicular to the plane containing both v and B. If v and B are parallel or anti-parallel, then sin θ = 0 and F = 0. However, if v and B are perpendicular, then sin θ = 1 and F has its maximum magnitude of F = qvB.
The magnetic force on a moving charge is exerted in a direction at a right angle to the plane formed by the direction of its velocity and the direction of the surrounding magnetic field. This results in centripetal acceleration, causing the particle to move along a circular path. The magnetic force changes the direction of the velocity but not the speed or kinetic energy of the particle.
In summary, magnetic forces are induced by moving charges and are always perpendicular to the direction of the charge's velocity. This is in contrast to electric forces, which act independently of the direction of the charge's movement.
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Frequently asked questions
Sources of electric force are electric charges, while sources of magnetic force are moving electric charges (conductors, for instance) or moving magnetic fields.
Electric forces act on static charges, while magnetic forces act on moving charges. Electric forces are independent of the direction the charge moves in, while magnetic forces are created perpendicular to the charge's direction.
Both forces can attract and repel, but the mechanisms are different. Electric forces involve electrically charged objects, while magnetic forces involve magnetic poles.
