Does it matter if I use AC or DC as a source to create an electromagnet? For example, suppose I have a coil which has about 50 turns. If I use the same AC or DC voltage, which will create a stronger magnetic field?
Kayla Mcdowell
Answered question
2022-10-14
For example, suppose I have a coil which has about 50 turns. If I use the same AC or DC voltage, which will create a stronger magnetic field?
Answer & Explanation
darkangel5991we
Beginner2022-10-15Added 10 answers
An AC circuit has the current reversing direction and changing in amplitude with the frequency of AC.. The magnetic field will follow.
In a DC setup the magnetic field is constant and follows the right hand rule . This is what you should use if you want something like a permanent magnet or in order to increase the strength of a permanent magnet.
In an AC setup it is continually changing:
"In alternating current (AC) electromagnets, used in transformers, inductors, and AC motors and generators, the magnetic field is constantly changing. This causes energy losses in their magnetic cores that are dissipated as heat in the core."
Use AC if you want a motor, for example.
As for stronger, DC is constant, while AC is alternating and falling in amplitude in the cycle, so DC will give the stronger field, except at the peak voltage of the AC cycle, when AC will be stronger. At the RMS voltage they will be equal but maybe of opposite sign, depending on the part of the ac cycle.
In addition with DC you can use a permanent magnet for a core and thus increase the value.
Hugo Stokes
Beginner2022-10-16Added 7 answers
So the proper comparison would be between 240V DC and 240V (RMS) AC, and which is stronger depends on how you average the AC magnetic field. The AC field will have a higher peak strength but the RMS strength will be the same as DC give or take a few eddy current losses in the core.
New Questions in Electromagnetism
The magnetic field inside a long straight solenoid carrying current
A)is zero
B)increases along its radius
C)increases as we move towards its ends
D)is the same at all pointsWhich of the following units is used to express frequency?
Hertz
Watt
Newton
PascalWhat does tangential force produce?
How Many Different Orbitals Are There?
What is value for electrons ?
Which of the following correctly describes the magnetic field near a long straight wire?
A. The field consists of straight lines perpendicular to the wire
B. The field consists of straight lines parallel to the wire
C. The field consists of radial lines originating from the wire
D. The field consists of concentric circles centered on the wireIs energy directly proportional to frequency?
What is a compass? How is a compass used to find directions?
Magnetic field lines never intersect each other because
There will be two directions of the field at the same point.
Feild lines repel each other
Field lines follow discrete paths only
If field lines intersect they create a new magnetic field within the existing fieldTwo parallel wires carry currents of 20 A and 40 A in opposite directions. Another wire carrying a current antiparallel to 20 A is placed midway between the two wires. The magnetic force on it will be
Towards 20 A
Towards 40 A
Zero
Perpendicular to the plane of the currentWhat is the wavelength of the light emitted when an electron in a hydrogen atom undergoes transition from the energy level n = 4 to energy level n = 2? What is the colour corresponding to their wavelengths? (Given )
A) 486 nm, Blue
B) 576 nm, Blue
C) 650, Blue
D) 450 nm, BlueTwo identical conducting spheres A and B are separated by a distance greater than their diameters the spheres carry equal charges and electrostatic force between them is F a third identical uncharged sphere C is first brought in contact with A, then with B and finally removed as a result, the electrostatic force between A and B becomes
Why is alternating current used in homes?
Which of the following radiation has the shortest wavelength.
X-ray
Infra red
microwave
ultravioletHow to find the local extrema for ?
