Lenz's Law (A-level Physics)

In this video,
(1) we introduce Lenz's Law
(2) and explain how to use Lenz's Law to deduce the directions of induced currents when a bar magnet moves towards and away from a coil.
(3) We also use Lenz's law to explain the directions of the induced current in a coil when it moves through a uniform magnetic field.
(4) Finally, we explain the negative sign in the equation E= -d\phi/dt as a manifestation of Lenz's Law.