What is Light - edhs2dscience
... Mechanical Waves vs Electromagnetic Wave • water wave: energy moves ahead by vibrating water • Sound wave: energy moves ahead by vibrating air • Wave in a rope: rope twists to send energy impulse ahead • Electromagnetic wave does not need medium. It can travel through vacuum, a space free of matter ...
... Mechanical Waves vs Electromagnetic Wave • water wave: energy moves ahead by vibrating water • Sound wave: energy moves ahead by vibrating air • Wave in a rope: rope twists to send energy impulse ahead • Electromagnetic wave does not need medium. It can travel through vacuum, a space free of matter ...
Problems and solutions on Magnetism
... and moves horizontally to the north. What are the magnitude and the direction of the smallest vertical magnetic field that enables the wire to move in this fashion? Solution: For minimum field, B should be perpendicular to the wire. If the force is to be northward, the field must be directed dow nw ...
... and moves horizontally to the north. What are the magnitude and the direction of the smallest vertical magnetic field that enables the wire to move in this fashion? Solution: For minimum field, B should be perpendicular to the wire. If the force is to be northward, the field must be directed dow nw ...
Taking Demagnetization into Account in Permanent Magnets
... Table I: Different families of permanent magnets. Br: the magnetic induction that exists in the material in the absence of current. Hc: the coercive magnetic field. Tc: temperature at which material loses its magnetization (remanent flux density). In practice, permanent magnets are used to create a ...
... Table I: Different families of permanent magnets. Br: the magnetic induction that exists in the material in the absence of current. Hc: the coercive magnetic field. Tc: temperature at which material loses its magnetization (remanent flux density). In practice, permanent magnets are used to create a ...
Ch.20
... If a piece of iron is inserted in the solenoid, the magnetic field greatly increases, because the iron becomes a magnet. The resulting magnetic field is the sum of the field due to the current and the field due to the iron, and can be hundreds or thousands time of the field due to the current alone. ...
... If a piece of iron is inserted in the solenoid, the magnetic field greatly increases, because the iron becomes a magnet. The resulting magnetic field is the sum of the field due to the current and the field due to the iron, and can be hundreds or thousands time of the field due to the current alone. ...
The Force a Magnetic Field Exerts on a moving Charge
... Now we will find the direction of the field. We know the direction of the velocity (east) and the direction of the force due to the magnetic field (up, out of the page). Therefore we can use the second right hand rule (we will use the left hand, since an electron’s charge is negative). Point the poi ...
... Now we will find the direction of the field. We know the direction of the velocity (east) and the direction of the force due to the magnetic field (up, out of the page). Therefore we can use the second right hand rule (we will use the left hand, since an electron’s charge is negative). Point the poi ...
24 Magnetism Answers and Solutions for Chapter 24 Reading
... The net force on a compass needle is zero because its north and south poles are pulled in opposite directions with equal forces in the Earth’s magnetic field. When the needle is not aligned with the magnetic field of the Earth, then a pair of torques (relative to the center of the compass) is produc ...
... The net force on a compass needle is zero because its north and south poles are pulled in opposite directions with equal forces in the Earth’s magnetic field. When the needle is not aligned with the magnetic field of the Earth, then a pair of torques (relative to the center of the compass) is produc ...
magnetic field strength, H
... If the magnetic field is generated by solenoid consisting of: N= closely spaced turns, l =length, I= current magnitude The units of H are amperes per meter. ...
... If the magnetic field is generated by solenoid consisting of: N= closely spaced turns, l =length, I= current magnitude The units of H are amperes per meter. ...
TITLE OF LEARNING OBJECT What are the physics
... by distance a. When the distance between them doubles, the force is reduced to: A. B. C. D. ...
... by distance a. When the distance between them doubles, the force is reduced to: A. B. C. D. ...
Theoretical Question T3
... The first is called the paramagnetic effect, in which all the electrons can lower their energy by aligning the electron magnetic moments parallel to the magnetic field instead of forming Cooper pairs with opposite spins. The second is called the diamagnetic effect, in which increasing the magnetic f ...
... The first is called the paramagnetic effect, in which all the electrons can lower their energy by aligning the electron magnetic moments parallel to the magnetic field instead of forming Cooper pairs with opposite spins. The second is called the diamagnetic effect, in which increasing the magnetic f ...
615-4700 (10-155) St. Louis Motor
... how a varied magnetic field strength will alter the force experienced by a current carrying conductor. Again, the current may be varied by changing the number of dry cells applied in series to the electromagnet attachment, or by using a constant power supply connected in series with a rheostat and t ...
... how a varied magnetic field strength will alter the force experienced by a current carrying conductor. Again, the current may be varied by changing the number of dry cells applied in series to the electromagnet attachment, or by using a constant power supply connected in series with a rheostat and t ...
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.