Magnetic effect of a current

What the syllabus asks of you

• Describe the pattern and direction of the 4 State the qualitative variation of the strength of magnetic field due to currents in straight wires the magnetic field around straight wires and and in solenoids solenoids
• Describe an experiment to identify the pattern of the magnetic field (including direction) due to currents in straight wires and in solenoids
• Describe how the magnetic effect of a current is used in relays and loudspeakers and give examples of their application 5 Describe the effect on the magnetic field around straight wires and solenoids of changing the magnitude and direction of the current