![L 28 Electricity and Magnetism [5]](http://s1.studyres.com/store/data/001622578_1-908dc8960206010e5106ba81527ae842-300x300.png)
Course Outline - Madeeha Owais
... The definition of the magnetic field, the magnetic force on free charges and currents, Inductance Steady magnetic field ...
... The definition of the magnetic field, the magnetic force on free charges and currents, Inductance Steady magnetic field ...
Nat 4-5 Unit 2 Section 2 pupil notes - update
... 5. State that the region surrounding a magnet is called a magnetic field and describe some factors that could affect the magnetic field 6. State that a magnetic field exists around a current-carrying wire and describe some factors that could affect the magnetic field around the wire 7. Give two exam ...
... 5. State that the region surrounding a magnet is called a magnetic field and describe some factors that could affect the magnetic field 6. State that a magnetic field exists around a current-carrying wire and describe some factors that could affect the magnetic field around the wire 7. Give two exam ...
Motors and Generators
... • A strong current is suddenly switched on in a wire, but no force acts on the wire. Can you conclude that there is no magnetic field at the location of the wire? • No. It is possible that there is a magnetic field but that it is parallel to the wire. There is no force when a magnetic field and a wi ...
... • A strong current is suddenly switched on in a wire, but no force acts on the wire. Can you conclude that there is no magnetic field at the location of the wire? • No. It is possible that there is a magnetic field but that it is parallel to the wire. There is no force when a magnetic field and a wi ...
File
... wire is circular. It weakens as the distance from the wire increases. The field is perpendicular to the wire. Since the field is circular we can easily magnify it by coiling the wire. ...
... wire is circular. It weakens as the distance from the wire increases. The field is perpendicular to the wire. Since the field is circular we can easily magnify it by coiling the wire. ...
LEP 4.3.06 Magnetic field inside a conductor
... for a long straight conductor, where | r | is the distance of point P, at which the magnetic flux density is measured, from the axis of the conductor. ...
... for a long straight conductor, where | r | is the distance of point P, at which the magnetic flux density is measured, from the axis of the conductor. ...
21.2 Electromagnetism
... • The current can be used to turn the magnetic field ____ on and ____. off ...
... • The current can be used to turn the magnetic field ____ on and ____. off ...
4 - Ivor Catt`s
... coils of wire around an iron[verification needed] ring, and found that, upon passing a current through one coil, a momentary current was induced in the other coil.[5] This phenomenon is now known as mutual induction. The iron ring-coil apparatus is still on display at the Royal Institution. In subse ...
... coils of wire around an iron[verification needed] ring, and found that, upon passing a current through one coil, a momentary current was induced in the other coil.[5] This phenomenon is now known as mutual induction. The iron ring-coil apparatus is still on display at the Royal Institution. In subse ...
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... at a distance 1 cm from the same wire is (A) 2 (10-4 ) T (B) 3(10-4) T (C) 4 (10-3) T (D) 1.11(10-4 ) T 2. If B1 is the magnetic field at a point on the axis of a circular coil of radius R at a distance of R 3 and B2 is the magnetic field at the center of the coil, then ratio of B1 : B2 is (A) 1 : 3 ...
... at a distance 1 cm from the same wire is (A) 2 (10-4 ) T (B) 3(10-4) T (C) 4 (10-3) T (D) 1.11(10-4 ) T 2. If B1 is the magnetic field at a point on the axis of a circular coil of radius R at a distance of R 3 and B2 is the magnetic field at the center of the coil, then ratio of B1 : B2 is (A) 1 : 3 ...
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful 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.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.