exam2_solutions
... There is no magnetic force on the top and bottom legs, since they are parallel to the B field. However, the magnetic force on the right side is into the page, and the magnetic force on the left side is out of the page. Therefore, the entire loop will tend to rotate. This is how a motor works! ...
... There is no magnetic force on the top and bottom legs, since they are parallel to the B field. However, the magnetic force on the right side is into the page, and the magnetic force on the left side is out of the page. Therefore, the entire loop will tend to rotate. This is how a motor works! ...
General Physics II - Tennessee State University
... 11. Calculate the change in entropy of 250 g of water heated slowly from 20 oC to 80 oC. a) 300 J/K b) 253 J/K c) 195 J/K d) 98 J/K 12. Two small beads having positive charges 3q and q are fixed at the opposite ends of a horizontal insulating rod extending from the origin to the point x=d. A third s ...
... 11. Calculate the change in entropy of 250 g of water heated slowly from 20 oC to 80 oC. a) 300 J/K b) 253 J/K c) 195 J/K d) 98 J/K 12. Two small beads having positive charges 3q and q are fixed at the opposite ends of a horizontal insulating rod extending from the origin to the point x=d. A third s ...
1
... (-a,0) and (+a,0) as shown. Vse the symbols ~(Coulomb constant), and unit E-;: t J'-) t t ~ j vectors t and j, as needed. ...
... (-a,0) and (+a,0) as shown. Vse the symbols ~(Coulomb constant), and unit E-;: t J'-) t t ~ j vectors t and j, as needed. ...
Magnetism Notes - Brookwood High School
... ► Breaking a magnet in half will not separate the poles – only makes two smaller magnets ...
... ► Breaking a magnet in half will not separate the poles – only makes two smaller magnets ...
magnet
... magnetic domains in the same direction. • If you place a permanent magnet near a nail, the magnet aligns the magnetic domains and the nail becomes a temporary magnet. • A permanent magnet can be made by placing the metal in a strong magnetic field. • Permanent magnets can lose their magnetic behavio ...
... magnetic domains in the same direction. • If you place a permanent magnet near a nail, the magnet aligns the magnetic domains and the nail becomes a temporary magnet. • A permanent magnet can be made by placing the metal in a strong magnetic field. • Permanent magnets can lose their magnetic behavio ...
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.