1.9 - Electromagnetism

• At which part of a magnet are the magnetic forces the strongest?

  the poles of the magnet
• What happens when two magnets are brought close to each other?

  they exert a force on eachother
• What type of force is exerted if 2 like poles of a magnet are brought near each other?

  a repulsive, non contact force
• What type of force is exerted if 2 unlike poles of a magnet are brought near each other?

  an attractive non contact force
• What is a magnetic field?

  the region surrounding a magnet where another magnet or magnetic material experiences a non contact force
• What is produced when current flows through a conducting wire?

  a magnetic field is produces around the wire
• How do you work out the direction of the field around a current carrying wire?

  Using the right hand grip rule
• What determines the strength if the magnetic field around a current carrying wire?

  magnitude of the current flowing through the wire, coils around the wire, distance from wire
• A solenoid is a coil of wire which when current passes through creates a strong magnetic field
• The magnetic field found inside a solenoid is string and uniform
• An electromagnet is a solenoid with an added iron core which increases the strength of the magnetic field
• The motor effect is when a force is exerted between a magnetic field and a current carrying conductor places in that field
• The rule used to determine the force experienced due to the motor effect is Fleming”s left and rule
• When using flemings left hand rule, the forefinger points in the direction of the magnetic field
• In Flemings left hand rule the second finger points in the direction of the current flow in the conductor
• What factors affect the size of the force on current carrying wire in a magnetic field?

  magnitude of the current flowing through the conductor, strength of the magnetic field that the conductor is placed in
• If the direction of current in a current carrying wire placed in a uniform magnetic field is reversed what happens to the force?

  direction of the force is reversed
• If the strength of the current in a current carrying wire is placed in a uniform magnetic field is increased what happens to the force?

  strength / magnitude of the force is increased