11.2-4/12.2/13.1 Magnetism

emf generated by a running motor, because it consists of a coil turning in a magnetic field; it opposes the voltage powering the motor

• back emf
• cosmic rays
• helical motion
• induced emf

an equation giving the magnetic field at a point produced by a current-carrying wire

• Faraday’s law
• Biot-Savart law
• gauss
• tesla

comprised of particles that originate mainly from outside the solar system and reach Earth

• back emf
• helical motion
• cosmic rays
• induced emf

device for converting mechanical work into electric energy; it induces an emf by rotating a coil in a magnetic field

• gauss
• tesla
• right-hand rule-1
• electric generator

induced emf is created in a closed loop due to a change in magnetic flux through the loop

• Faraday’s law
• Biot-Savart law
• gauss
• tesla

G, unit of the magnetic field strength; 1G=10−4T

• Faraday’s law
• gauss
• Biot-Savart law
• tesla

superposition of circular motion with a straight-line motion that is followed by a charged particle moving in a region of magnetic field at an angle to the field

• back emf
• cosmic rays
• helical motion
• induced emf

short-lived voltage generated by a conductor or coil moving in a magnetic field

• back emf
• cosmic rays
• helical motion
• induced emf

continuous curves that show the direction of a magnetic field; these lines point in the same direction as a compass points, toward the magnetic south pole of a bar magnet

• magnetic field lines
• magnetic flux
• magnetic force
• right-hand rule-1

measurement of the amount of magnetic field lines through a given area

• magnetic field lines
• magnetic flux
• magnetic force
• right-hand rule-1