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What is the formula for calculating power if you are given magnetic field?
Wiki User
∙ 15y ago
The formula for calculating power if you are given a magnetic field is sub 43
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∙ 15y ago
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Why DC motors are self starting?
As magnetic field of dc motor is constant. Whenever a current is given to rotor winding there will be a magnetic flux in air gap between rotor and winding so there will be torque in rotor of f=ibl. so due to this torque rotor get rotate and get started.
Why is it inductance does not affect current in a Direct Current circuit?
The Nature of InductanceAn inductor is, simply put, an electromagnet, the like of which many of us played with as children. A current through a wire is a flow of charges, and the movement of these charges generates a sort of 'wake' in spacetime, much like the wake of a ship on the ocean. We refer to this wake as a magnetic field, and the equation describing this is called Ampere's Law, which is one of Maxwell's Equations. When an inductor is first activated (when current begins), the flow of charge begins to set up a magnetic field in and around the coil. Since a magnetic field is a real thing, a kind of distortion of spacetime, the act of creating a magnetic field requires energy, and the inductor harvests the energy of the electrons to accomplish this. As a result, the electrons slow, and the inductor can be said to 'resist changes in current' by harvesting and storing energy.Naturally, there is a maximum magnetic field associated with any voltage, just as there is a maximum wake that can be generated by a ship moving at a given speed. When the inductor is 'fully magnetized,' when the magnetic field of the inductor is as large as the given current can possibly support, it stops harvesting energy from the circuit and simply holds on to the steady magnetic field that it has created. If the voltage should decrease, the magnetic field begins to collapse, depositing that energy back into the electrons, speeding them along. Thus, again, an inductor 'resists changes in current' by discharging energy.In conclusion, inductors create magnetic fields for energy storage, and they have a maximum storage of energy for a given voltage. In a 'DC circuit,' the inductor has had sufficient time to build up it's storage of energy and no longer harvests energy from the stream of electrons. It is 'full.'This also explains why the impedance of an inductor is said to be low at low frequencies, where the inductor has time to charge and discharge itself to keep up with the slowly changing voltages, and why that impedance is high at high frequencies, where the inductor is racing to keep up with the changes, constantly harvesting and spitting back energy.
How do you find variance?
You calculate it using the appropriate formula, which, given the limitations of this site, is not easy to reproduce. However, you can easily Google the formula.
Which field Oscar awards given?
anything related to films
What is the definition of a field?
In science, field means any part of the universes that has some measurable value of a given quantity at every point.
Uniform And Non-Uniform Magnetic field And Calculation of its strength?
The answer depends on the source of the magnetic field. For instance, the magnetic field due to a current carrying wire is given by the formula mu*I/(2*pi*r). Magnetic fields follow the principle super position so they can be added up no problem.
What is the formula for calculating radius if you are given diameter?
divide diameter by 2
What is the formula for calculating efficiency?
General formula for calculating efficiency is given by Efficiency = (output / input) * 100 It is denoted by greek letter Eta Efficiency cannot be more than 100%.
What is formula calculating velocity?
Veloicty is distance divided by time, for a object moving in a given direction. If direction is not given, then it is speed.
Can an electromagnets strength be changed?
The more electricity the more powerful the magnetic field. Increase the voltage, which for the given resistance of the coil, will also increase the current and the magnetic field.
What is the formula of calculating effective current if resistor and voltage is given?
I = E/R or Current = Voltage/Resistance (Ohm's Law)
What is the formula for calculating the central angle given chord length and radius?
You can use the cosine rule to calculate the central angle.
How do you calculate the magnetic field strength in an injector cyclotron?
- Magnetic field strength is the intensity of a magnetic field at a given location. Historically, a distinction is made between magnetic field strength H, measured in ampere/meter, and magnetic flux density B, measured in tesla. Magnetic field strength is defined as the mechanical force (newton) on a wire of unit length (m) with unit electric current(A). The unit of the magnetic field, therefore, is newton/ (ampere x meter), which is called tesla. The magnetic field may be visualized by magnetic field lines. The field strength then corresponds to the density of the field lines. The total number of magnetic field lines penetrating an area is called magnetic flux. The unit of the magnetic flux is tesla x m2 = weber. The older units for the magnetic flux, maxwell = 10-8 weber, and for the magnetic flux density, gauss = maxwell / cm2 = 10-4 tesla, are not to be used any more. Magnetic flux density diminishes with increasing distance from a straight current-carrying wire or a straight line connecting a pair of magnetic poles around which the magnetic field is stable. At a given location in the vicinity of a current-carrying wire, the magnetic flux density is directly proportional to the current in amperes. If a ferromagnetic object such as a piece of iron is brought into a magnetic field, the "magnetic force" exerted on that object is directly proportional to the gradient of the magnetic field strength where the object is located. ------------------------------------------------------------------- B=μH Magnetic field in Solenoid B=μnI where n is turns/m So H=nI --------------------------------------------
Do all parts of a magnet have the same force?
The simple answer is yes. The magnetic field, as with gravity, appears to emanate from the centre point. At a given distance and without interference, the magnetic field would be the same strength.
Formula of a rectangle?
There is no formula for a rectangle. There are formula for calculating its area, perimeter or length of diagonals from its sides, or it is possible to calculate the length of one pair of sides given the other sides and the area or perimeter, or the two lots of sides given area and perimeter and so on.
What is the formula of calculating weight of a round bar of en1a material if its diameter and length is given?
Density or weight is calculated by mass/volume
When you use the Distance Formula you are calculating the length of the of a right triangle whose goes between two given points?
hyputenus,hyputenus
