A current traveling through a loop of wire creates a magnetic field along the axis of the loop. The direction of the field inside the loop can be found by curling the fingers of the right hand in the direction of the current through the loop; the thumb then points in the direction of the magnetic field.
How does an electric current produce a magnetic field?
When a charged particle such as an electron moves, it produces a magnetic field. Because an electric current generally consists of moving electrons, a current in a wire produces a magnetic field. In fact, the wire acts as a magnet. … The direction of the current determines the direction of the magnetic field.
What is the relationship between current and magnetic field?
Relationship Between Current and Magnetic Field
The strength of a magnetic field is directly proportional to the current flowing. Therefore, if an alternating current is flowing, a magnetic field around the conductor will be produced, that is in phase with the alternating current.
What can cause a magnetic field?
When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field. The piece of iron has become a magnet. Some substances can be magnetized by an electric current.
How does a magnetic field affect the human body?
Low-frequency magnetic fields induce circulating currents within the human body. The strength of these currents depends on the intensity of the outside magnetic field. If sufficiently large, these currents could cause stimulation of nerves and muscles or affect other biological processes.
Who said that current can cause magnetic field?
Hans Christian Oersted
Does current produce electric field?
Yes, an electric current =does= produce an electric field. This is due to relativity, specifically the Lorentz Contraction. … But then we’d have to differentiate between a static electromagnetic force (electric field) and a moving electromagnetic force (magnetic field).
Where is the magnetic field strongest?
The magnetic field is strongest at the center and weakest between the two poles just outside the bar magnet. The magnetic field lines are least dense at the center and densest between the two poles just outside the bar magnet.
How do you calculate current in a magnetic field?
How to calculate magnetic field around a wire?
- I is the current;
- d is the distance from the wire;
- B is the strength of the magnetic field produced at distance d;
- μ0 is the permeability of free space which have constant value μ0 = 4 * π * 10^(-7) [T * m / A] .
What is the magnetic effect of current?
The magnetic effect of electric current is known as electromagnetic effect. It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected because of flow of electricity. This shows that electric current produces a magnetic effect.
What is meant by magnetic field?
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. … Magnetic fields surround magnetized materials, and are created by electric currents such as those used in electromagnets, and by electric fields varying in time.
Why can’t magnetic field lines cross?
Magnetic field lines can never cross, meaning that the field is unique at any point in space. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole.
What affects the strength of a magnetic field?
Factors Affecting the Strength of the Magnetic Field of an Electromagnet: Factors that affect the strength of electromagnets are the nature of the core material, strength of the current passing through the core, the number of turns of wire on the core and the shape and size of the core.
Can magnetic field kill you?
Fields in excess of 109 Gauss, however, would be instantly lethal. Such fields strongly distort atoms, compressing atomic electron clouds into cigar shapes, with the long axis aligned with the field, thus rendering the chemistry of life impossible.
Do magnets affect the brain?
In TMS, a strong magnetic pulse induces tiny electrical currents in the affected brain tissue. These currents can activate nerve cells. In medicine, TMS is used to diagnose impairments of motor function such as in multiple sclerosis or as a result of a stroke.
How much magnetic field is safe?
A continuous exposure limit of 40 mT is given for the general public. Static magnetic fields affect implanted metallic devices such as pacemakers present inside the body, and this could have direct adverse health consequences.