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How is the magnetic field of an eletromagnet controlled?
The intensity of the magnetic field (measured in Teslas) produced by an electromagnet is directly proportional to the current (measured in Amperes) passing through it's coil windings. Therefore, as long as other variables remain constant, one can vary the intensity of the magnetic field by varying the current. Specifically, the intensity of the magnetic field will vary by the same factor as the current, so if the current is halved, the intensity of the magnetic field will also be halved; and if the current is tripled, the intensity of the magnetic field will also be tripled.
How can you strengthen a solenoid's magnetic field?
Think of the four C's- Add more Coils- Add an iron Core- Add a stronger Current- Make the coils Closer
What two factors determine the potential energy of an elevated object?
Potential energy can be descirbed in many forms: gravitational potential, electrical potential and so forth. For gravitational potential energy, the formula is E=mgh, where E is the gravitational potential energy, m is the mass of the object , g is the strength of the prevailent gravitational field and h is the height above that field. In this instance, the factors determing the potential energy are threefold; the mass, the gravitational field strength and the height. For electrical potential, the factors vary depending on what electrical field, componant or senario you are dealing with. In essence, an object has electrical potential energy when it has become charged (such as an Ion), or it is feeling the effects of conflicting magnetic feilds and motion (as in electro-magnetic induction).
What produces a magnetic field?
The outer electrons in a metallic bar all allign themselves within the bar to generate a single field with magnetic properties. The element, Iron, have this property but it is also seen in other metals in the Periodic Table.
Does mass vary according to the force of gravity?
No, mass does not vary according to the force of gravity. Mass is a measure of how much matter an object has. Weight, however, is a measure of the force of gravity acting on an object; as such, weight varies according to gravitational field strength.
What are two primary differences between an electromagnets magnetic field and earths magnetic field?
First one is artificial where as the latter is natural We could increase or decrease the strength of magnetic field but we cannot vary earth's Intense field could be produced but earth's field is feeble in comparison with artificial
Why is dc current used in the excitation of generator?
The field current is used for the excitation of generators.AnswerYou use DC current, because you want the resulting magnetic field to be constant. If you used AC, the resulting magnetic field would vary in both strength and direction.
What type of metal can repel a magnet?
All metals can repel a magnet. The degree to which they do so is dependent on whether they are ferromagnetic, paramagnetic, or diamagnetic.A ferromagnetic metal is one which has a magnetic field regardless of whether or not they are subjected to an applied or external magnetic field. These are often called permanent magnets. The strength of their magnetic field varies depending on the strength of the external magnetic field, but has a limit outside of the external field. Iron is an example of a ferromagnetic metal.A paramagnetic metal is one which has a magnetic field only when subjected to an applied or external magnetic field. The strength of a paramagnetic metal's magnetic field tends to vary proportionally with the external magnetic field, and so these are often the strongest magnets that we see. An electromagnet is the easiest way to conceptualize the way a paramagnetic metal works. When an electromagnetic circuit is turned on, it's a magnet, when it's turned off, it's not. Tungsten is an example of a paramagnetic metal.Diamagnetism is a property of all materials, not just metals. This property is kind of hard to explain classically, so just think of it as a material's magnetic field created, when subjected to an external magnetic field, because of all of the material's electrons being pulled one way, and all of the material's protons being pushed the other way. The strength of a magnetic field from a purely diamagnetic material is farweaker than that of a paramagnetic or ferromagnetic material's magnetic field.
How is the magnetic field of an eletromagnet controlled?
The intensity of the magnetic field (measured in Teslas) produced by an electromagnet is directly proportional to the current (measured in Amperes) passing through it's coil windings. Therefore, as long as other variables remain constant, one can vary the intensity of the magnetic field by varying the current. Specifically, the intensity of the magnetic field will vary by the same factor as the current, so if the current is halved, the intensity of the magnetic field will also be halved; and if the current is tripled, the intensity of the magnetic field will also be tripled.
What is magnetic field?
A condition found in the region around a magnet or an electric current, characterized by the existence of a detectable magnetic force at every point in the region and by the existence of magnetic poles.Read more: magnetic-field
What does magnetic mean in science terms?
A magnetic field is a field of force produced (1) by moving electric charges, (2) by electric fields that vary in time, and (3) by the intrinsic magnetic field of elementary particles associated with the spin of the particle.
If you were to mechanically rotate the armature in an electric motor what would happen?
You said "armature" so it is a dc motor. Hence if the field is permanent magnet type then a voltage appears at the armature terminals nd its magnitude depends on the speed nd magnetic field strength. If it's field coils, then they must be seperately excited (if it don't possess residual). By changing the field strength you can vary the voltage produced at armature terminals.
Why is earth the largest magnet?
Well, first off the magnetic fields on the Sun, seen as plasma loops, are enormous compared to the size of the Earth - perhaps millions of km in altitude from the Sun's surface. These are the largest 'local' magnetic fields, both in size and strength.Bringing our feet back to the ground and considering the magnetic field of the Earth, this is probably caused by thermal effects in the outer core of the Earth generating electric currents, which in turn generate a magnetic field. The interior of the Earth is much too hot (about 6000K) to sustain any magnetic material. (see Curie effect). The field we see is the net field resulting no doubt from many disparate contributions, and which do vary in strength and location.
What is a magnetic field and how does it work?
Magnetic field is produced by varying electic field. It is a vector quantity. It originates from North pole and passes to south pole and it is a closed loop.Magnetic forces gives information about charge carriers in a material through Hall effectansw2. A magnetic field may be a fixed one - it does not need to vary. Consider a permanent magnet.All magnetic fields are caused by the movement of electrons. No moving electrons - no magnetic field.The Earth's magnetic field is created by electrical currents, running roughly parallel with the equator. There may be several such paths - we see the net effect.
What is a magnetic field and what it does?
Magnetic field is produced by varying electic field. It is a vector quantity. It originates from North pole and passes to south pole and it is a closed loop.Magnetic forces gives information about charge carriers in a material through Hall effectansw2. A magnetic field may be a fixed one - it does not need to vary. Consider a permanent magnet.All magnetic fields are caused by the movement of electrons. No moving electrons - no magnetic field.The Earth's magnetic field is created by electrical currents, running roughly parallel with the equator. There may be several such paths - we see the net effect.
What is magnetic pole wandering?
Magnetic pole wandering refers to the gradual movement of the Earth's magnetic poles over time. The Earth's magnetic field is not fixed and can vary in strength and direction. The North and South magnetic poles have been observed to slowly shift their positions, with the North Magnetic Pole moving towards Russia at a rate of about 10 kilometers per year.
How do you calculate the magnetic dipole moment of a bar magnet?
The strength of a magnet can be determined by measuring its flux density (B) which is expressed in teslas. The flux density will vary according to where relative to the magnet it is being measured. The instrument for doing this is a flux-density meter (which was called a 'gaussmeter' - 'gauss' being an obsolete unit of measurement for flux density, from the cgsA metric system).
