- What does magnetic field depend on?
- What is a dc magnetic field?
- Is electromagnet a permanent magnet?
- Why is AC stronger than DC?
- How does the magnetic field of a coil depend on the current in the coil?
- How magnetic field is created?
- How magnetic field is produced in a coil?
- What kind of magnetic field is produced by a current carrying circular coil?
- Is the Earth’s core magnetic?
- How current is responsible for the magnetic field of solenoid?
- How does the number of turns affect a coil magnetic field?
- Is it OK to coil power cables?
- What is a magnetic field made of?
- Why does coiling a wire increase current flow?
- Where is the magnetic force the weakest?
- What happens if you move a magnet near a coil of wire?
- Do magnetic fields have mass?
- Are electromagnets AC or DC?
- When current is circular magnetic field is straight?
- Where is the strongest magnetic field in a coil?
- Does coiling a wire increase resistance?
What does magnetic field depend on?
The magnitude of the magnetic force between them depends on how much charge is in how much motion in each of the two objects and how far apart they are.
The direction of the force depends on the relative directions of motion of the charge in each case..
What is a dc magnetic field?
DC FIELDS: Sometimes referred to as the geomagnetic field, this field provides a compass with the ability to indicate the direction of magnetic North. The “field strength” of the Earth’s magnetic field varies from place to place on the globe, but is generally between 350 – 500 milliGauss (mG).
Is electromagnet a permanent magnet?
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Why is AC stronger than DC?
A.C. is said to be four to five times more dangerous than D.C. For one thing, A.C. causes more severe muscular contractions. For another, it stimulates sweating, which lowers the skin resistance. … The frequency of the AC has a lot to do with the effect on the human body.
How does the magnetic field of a coil depend on the current in the coil?
A wire coil that is carrying a current produces a magnetic field B( r), where r is the distance from the center of the coil to the field point. The strength of the field B is proportional to the current I in the coil. The strength and direction of the field depend on r. … For large distances both fields fall off as 1/r3.
How magnetic field is created?
Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.
How magnetic field is produced in a coil?
An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix. … 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. The more turns of wire, the stronger the field produced.
What kind of magnetic field is produced by a current carrying circular coil?
Answer. Answer: At the centre of the circular loop, The magnetic field lines are straight. Each segment of circular loop carrying current produces magnetic field lines in the same direction with in the loop.
Is the Earth’s core magnetic?
The core of the Earth is also an electromagnet. Although the crust is solid, the core of the Earth is surrounded by a mixture of molten iron and nickle. The magnetic field of Earth is caused by currents of electricity that flow in the molten core.
How current is responsible for the magnetic field of solenoid?
When a direct electric current is passed through it, the shape of the magnetic field is very similar to the field of a bar magnet. The field inside a solenoid is strong and uniform. The small magnetic fields caused by the current in each turn of the coil add together to make a stronger overall magnetic field.
How does the number of turns affect a coil magnetic field?
As the number of turns increases the number of paper clips held increase. This means that the strength of the magnet increases with increasing number of turns in the coil. … We can say that, the strength of the electromagnet is directly proportional to the number of turns in the coil.
Is it OK to coil power cables?
While tightly coiled DC cables can generate enough heat to damage the insulation and cause shorts and fires, the danger is even greater with AC circuits. … While tightly coiled DC cables can generate enough heat to damage the insulation and cause shorts and fires, the danger is even greater with AC circuits.
What is a magnetic field made of?
Magnetic fields are produced by moving electric charges. Everything is made up of atoms, and each atom has a nucleus made of neutrons and protons with electrons that orbit around the nucleus. Since the orbiting electrons ≠are tiny moving charges, a small magnetic field is created around each atom.
Why does coiling a wire increase current flow?
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. Turning coils around and passing a current through them will make a much stronger electromagnet.
Where is the magnetic force the weakest?
The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
What happens if you move a magnet near a coil of wire?
When a magnet is moved into a coil of wire, changing the magnetic field and magnetic flux through the coil, a voltage will be generated in the coil according to Faraday’s Law. … The polarity of the induced emf is such that it produces a current whose magnetic field opposes the change that produces it.
Do magnetic fields have mass?
magnetic fields are produced by charged particles in motion, and depend on the charge and velocity of these particles, but not on their mass.
Are electromagnets AC or DC?
So both AC and DC can be used to produce electromagnets. Any current carrying conductor can produce a magnetic field around it. So both AC and DC can be used to produce electromagnets.
When current is circular magnetic field is straight?
When current is straight, it means the current is passing through a straight conductor, the magnetic field produced due to current through a straight conductor is in the form of concentric circle and are in a plane perpendicular to the plane of linear conductor. It means the magnetic field is circular.
Where is the strongest magnetic field in a coil?
The resultant static magnetic field with a north pole at one end and a south pole at the other is uniform and a lot more stronger in the centre of the coil than around the exterior.
Does coiling a wire increase resistance?
The resistance does not change. … If you coil a wire its resistance does not change. As that is purely down to the material that the wire is made out of and the diameter, temperature coefficient and the length of the wire. Coiling the wire will however will change the inductance of the wire.