0
What else can I help you with?
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.
What is the formula for calculating the magnetic flux through a loop?
The formula for calculating the magnetic flux through a loop is given by B A cos(), where is the magnetic flux, B is the magnetic field strength, A is the area of the loop, and is the angle between the magnetic field and the normal to the loop.
What is the formula for calculating the magnetic field due to a dipole?
The formula for calculating the magnetic field due to a dipole is given by: B dfracmu04pi left( dfrac2mr3 right) where: ( B ) is the magnetic field, ( mu0 ) is the permeability of free space, ( m ) is the magnetic moment of the dipole, and ( r ) is the distance from the dipole.
What is the formula for calculating the magnetic field of a solenoid?
The formula for calculating the magnetic field of a solenoid is given by B nI, where B is the magnetic field strength, is the permeability of free space, n is the number of turns per unit length of the solenoid, and I is the current flowing through the solenoid.
What is the formula for calculating the amplitude of an electric field?
The formula for calculating the amplitude of an electric field is given by E cB, where E represents the electric field amplitude, c is the speed of light in a vacuum, and B is the magnetic field amplitude.
What is the formula for calculating the magnetic field strength inside a solenoid?
The formula for calculating the magnetic field strength inside a solenoid is given by B nI, where B is the magnetic field strength, is the permeability of free space, n is the number of turns per unit length of the solenoid, and I is the current flowing through the solenoid.
What is the equation for calculating the magnetic field strength around a current-carrying wire?
The equation for calculating the magnetic field strength around a current-carrying wire is given by the formula: B ( I) / (2 r), where B is the magnetic field strength, is the permeability of free space, I is the current flowing through the wire, and r is the distance from the wire.
What is the mathematical expression for the magnetic field cross product in physics?
The mathematical expression for the magnetic field cross product in physics is given by the formula: B A x B.
What is the formula for calculating electromagnetic wave intensity?
The formula for calculating electromagnetic wave intensity is given by the equation: Intensity (Electric field strength)2 / (2 Permittivity of free space Speed of light)
What is the formula for calculating the intensity of an electromagnetic wave?
The formula for calculating the intensity of an electromagnetic wave is given by I E2 / (2 c), where I is the intensity, E is the electric field strength, is the permeability of the medium, and c is the speed of light.
What is the magnitude of the magnetic flux through this circle due to a uniform magnetic field?
The magnitude of the magnetic flux through a circle due to a uniform magnetic field depends on the strength of the magnetic field, the area of the circle, and the angle between the magnetic field and the normal to the circle. The formula for magnetic flux is given by Φ = BAcos(θ), where B is the magnetic field strength, A is the area of the circle, and θ is the angle between the magnetic field and the normal to the circle.
What is Magnetic flux dimensional formula?
The dimensional formula for magnetic flux is given by [M^1L^2T^-2A^-1], where M represents mass, L represents length, T represents time, and A represents electric current. Magnetic flux is defined as the product of the magnetic field strength and the area through which the magnetic field is passing.
What is the microwave formula for calculating the wavelength of a given frequency?
The microwave formula for calculating the wavelength of a given frequency is: Wavelength () Speed of Light (c) / Frequency (f).
