Learning Objectives

(a) draw the pattern of magnetic field due to currents in straight wires and in solenoids and state the variation in magnetic field strength over different parts of the pattern

(b) state the effect of changing the magnitude and/or direction of the current on the magnetic field

(c) describe the applications of the magnetic effect of a current in a circuit breaker

(d) describe an experiment to show the force on a current-carrying conductor, and on a beam of charged particles in a magnetic field, including the effect of reversing the (i) current (ii) direction of the field

(e) deduce the relative directions of force, field and current when any two of these quantities are at right angles to each other using Fleming’s left-hand rule

(f) describe the field patterns between currents in parallel conductors and relate these to the forces which exist between the conductors (excluding the Earth’s field)

(g) explain how a current-carrying coil in a magnetic field experiences a turning effect and how this is affected by the (i) number of turns in the coil (ii) current

(h) discuss how this turning effect relates to the action of an electric motor

(i) describe the action of a split-ring commutator in a two-pole, single coil motor and the effect of a soft-iron cylinder

(j) appreciate similarities and differences between D.C. motor and A.C. motor

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Electromagnets

Magnetic field around electric current carrying conductor (Magnet) - 12 Jul


Force on a current carrying conductor in a magnetic field (Pressure) - 13 Jul


Electric motor (Adiabatic) - 19 Jul


Loudspeaker (Albedo) - 19 Jul

Interesting articles on electromagnetism

Hopes rise for new cancer treatment after tests with electromagnetism
A Magnetic Field Applied to the Brain Can Alter People's Sense of Morality


Peer Evaluation form for presentation