Introduction

• Magnetism & electromagnetism 9'46"

• Magnetic field around a conductor 8'01"

Magnetic field around a conductor: Current direction:

• • • upward 13"

    • downward 8"

Magnetic field around a solenoid: North induced on solenoid's:

• • • right 17"

    • left 11"

• • • Lenz's law 2'01"

    • Direction of induced PD 28"

    • Magnet dropped through coil 27"

    • Lenz's law and magnet dropped through coil 1'54"

• Introduction 5'42"

• Induction 4'51"

• Worked exam question 16'69" (Download question)

Practical demonstrations

• • • Effect of number of coils and magnet strength:

      • 120 turns 38"

      • 240 turns 17"

      • 360 turns 28"

    • Effect of speed of magnet motion 18"