Electromagnetism

Cards (76)

  • The strength of a magnetic field decreases with distance from the source.
  • Magnetic fields can be represented using field lines or vectors.
  • A current-carrying wire produces a magnetic field around it, with the direction determined by the right hand rule (thumb points in the direction of the current, fingers curl around the wire).
  • The strength of a magnetic field can be indicated by the density of the field lines.
  • Magnetic field lines never cross or intersect.
  • Magnetic field lines are imaginary lines that surround a magnetic field and indicate the direction of the field at any point.
  • The magnetic field lines are perpendicular to the direction of motion.
  • The strength of a magnetic field is determined by the density of the magnetic field lines, with a higher density indicating a stronger magnetic field and a lower density indicating a weaker magnetic field.
  • Magnetic fields are created by moving charges or current-carrying wires.
  • Field lines are imaginary lines that show the direction and intensity of a magnetic field, with closer lines indicating stronger fields.
  • Vectors represent the magnitude and direction of a force at any point in space.
  • A compass needle is used to measure the direction of a magnetic field by aligning it along the field lines.
  • Electric charges moving through a conductor produce a magnetic field that is perpendicular to both the motion of the charge and the direction of the electric field.
  • When two parallel wires carry equal currents in opposite directions, they attract each other due to their magnetic fields.
  • Moving charged particles create a magnetic field, which can interact with other magnets or magnetic materials.
  • Field lines are perpendicular to the surface where they enter/exit.
  • Field lines are always perpendicular to the surface where they enter/exit.
  • Electric charges produce electric fields that exert forces on other charged objects.
  • Field lines always start on north poles and end on south poles.
  • Stronger magnets have more tightly packed field lines.
  • If the charge is positive, the force will always act towards the left side of the diagram.
  • In a uniform magnetic field, the force acting on a charged particle is constant and parallel to the magnetic field lines.
  • Electrically charged particles create their own magnetic field around them.
  • A compass needle aligns itself along the direction of the magnetic field due to its own small magnetization.
  • When a bar magnet is suspended freely, it aligns itself along a North-South axis due to Earth's magnetic field.
  • Like poles repel each other while unlike poles attract each other.
  • The magnetic field lines are denser near the poles of the magnet and become less dense as distance increases.
  • The magnetic field lines always form closed loops, starting from one end of the magnet and returning back to where they started.
  • The direction of the magnetic field is represented by the direction of the arrow on the magnetic field line.
  • A vector can be represented as an arrow pointing in the direction of the force and having a length proportional to its magnitude.
  • Electric charge can be positive (+) or negative (-).
  • Charge is conserved - it cannot be created or destroyed, only transferred from one object to another.
  • Moving charges create a magnetic field around them due to their velocity.
  • Current flowing through a wire creates a magnetic field around it.
  • The right hand rule can be used to determine the direction of the magnetic field produced by a current carrying wire.
  • The magnetic field produced by the coil strengthens when the current increases and weakens when the current decreases.
  • An electromagnet can be made by wrapping a coil around an iron core and passing a current through it.
  • When the current flows through the coil, the magnetic field lines are concentrated at the centre of the coil, creating a strong magnetic field that attracts nearby ferrous objects.
  • Magnetic fields have lines of force that show the strength and direction of the magnetic field at any point.
  • Magnetic fields are measured using a compass needle which aligns with the lines of flux (magnetic field lines).