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How does coil affect magnetic field?
The advantage of using the coil shape is that it increases the strength of the magnetic field produced by a given current. The magnetic fields generated by the separate turns of wire all pass through the center of the coil and add (superpose) to produce a strong field there.
What are the factors affecting coil inductance?
Inductors or coils are very common in electrical circuits and there are many factors which determine the inductance of a coil such as the shape of the coil, the number of turns of the insulated wire, the number of layers of wire, the spacing between the turns, the permeability of the core material, the size or cross- …
What happens to the magnetic field if you increase the number of coils?
N Increasing the number of coils, which adds more field lines and makes the electromagnet stronger. This is the magnetic field around a piece of wire, compared to a magnetic field on a loop or solenoid it is weak. Putting a piece of iron or steel inside the coil makes the magnet strong enough to attract objects.
Why do currents create magnetic fields?
As Ampere suggested, a magnetic field is produced whenever an electrical charge is in motion. The spinning and orbiting of the nucleus of an atom produces a magnetic field as does electrical current flowing through a wire. The direction of the spin and orbit determine the direction of the magnetic field.
Who said that current can cause magnetic field?
Oersted.
How are coil losses related to inductance and impedance?
No active power (heat loss) is dissipated in the reactance X L due to the 90° phase shift between voltage and current. The total coil losses can be combined into the loss resistance (R), which is connected in series with the ideal inductance (L).
The impedance (Z) is frequency dependent and is composed of the geometric sum of the loss resistance (R) and the reactance (X L) of the ideal coil (L). Impedance rises with increased frequency. This linear relationship continues to infinitely high frequencies for an ideal coil.
How does the magnetic field change with high frequency?
This magnetic field changes rapidly as a result of the high frequency, so that a voltage is induced in the conductor and in the neighbouring conductors. This voltage generates a current that opposes the original current. So additional currents are produced in the conductor, as well as in the neighbouring conductors.
What happens to the magnetic field around a conductor?
The current flowing through a conductor generates a magnetic field around this conductor. This magnetic field changes rapidly as a result of the high frequency, so that a voltage is induced in the conductor and in the neighbouring conductors. This voltage generates a current that opposes the original current.