What you’ll learn5 learning objectivesChoose one objective for a focused lesson, or study the complete topic.4.5.3.1Pattern and direction of the magnetic• Describe the pattern and direction of the magnetic field due to currents in straight wires and in solenoidsSyllabus objective4.5.3.2An experiment to identify the pattern• Describe an experiment to identify the pattern of the magnetic field (including direction) due to currents in straight wires and in solenoidsSyllabus objective4.5.3.3Magnetic effect of a current is used• Describe how the magnetic effect of a current is used in relays and loudspeakers and give examples of their applicationSyllabus objective4.5.3.4Qualitative variation of the strength• State the qualitative variation of the strength of the magnetic field around straight wires and solenoidsSyllabus objective4.5.3.5Effect on the magnetic field around• Describe the effect on the magnetic field around straight wires and solenoids of changing the magnitude and direction of the currentSyllabus objective