| A | B |
|---|
| A generator consists of 10.0 turns of wire, each turn has an area of 0.095 m2. If a maximum emf of 1.2 ยด 102 V is induced when the coil rotates with a frequency of 60.0 Hz, what is the strength of the magnetic field? | 0.34T |
| Which conversion process is the basic function of the electric generator? | mechanical energy to electrical energy |
| Which conversion process is the basic function of the electric motor? | electrical energy to mechanical energy |
| The magnetic field of a bar magnet is shown in the figure above. Is the magnet's north pole at A or B? | A |
| A negative charge is moving through a magnetic field. the direction of motion and the direction of the force acting on it at one moment are shown in the figure above. Find the direction of the magnetic field. | upward, toward the top of the page |
| An electron moves north at a velocity of 9.8 x 10 4 m/s and has a magnetic force of 5.6 x 10 -18 N west exerted on it. If the magnetic field points upward, what is the magnitude of the magnetic field? | 3.6 x 10 -4 T |
| A wire 48 m long carries a current of 18 A from west to east. If a magnetic field of 8.3 x 10 -4 T directed toward the south is acting on the wire, find the direction and the magnitude of the magnetic force. | .72 N downward |
| A coil with 275 turns and a cross-sectional area of 0.750 m2 experiences a magnetic field whose strenght increases by+0.900 T in 1.25 s. The plane of the coil is perpendicular to the plane of the magnetic field. What is the induced emf in the coil? | -148.5 v |
| A coil with 650 turns produces an emf of 120 V as it passes through a magnetic field in 2.7 s. The magnetic field change is -0.935 T. The plane of the coil moves perpendicularly to the plane of the magnetic field. What is the are of the coil? | 0.53 m2 |
| A microscopic magnetic region composed of a group of atoms whose magnetic fields are aligned in a common direction is called a(n)________. In most materials, when these groups are randomly distributed, the substance will show_____ no magnetism. | domain; no |
| A solenoid is in an upright position on a table. A counterclockwise current of electrons-- when viewed from above--causes the solenoid to have a ______ magnetic pole at its bottom end. If a compass is placed at the top of the solenoid, the north pole of the compass would be_______. | south; repelled |
