Induced Potential (ht Only) (GCSE Physics)

A rectangular loop is pulled quickly out of a region of uniform magnetic field. During extraction the induced emf is larger than if the loop is pulled slowly because

According to Lenz’s law, the direction of an induced current in a loop is such that it

Which physical quantity is magnetic flux through an area A in a uniform magnetic field B at angle ? between field and area normal?

Which quantity is directly proportional to the induced emf in a coil when the coil has N turns?

In a moving-coil loudspeaker, sound causes the coil to move in the magnetic field; this produces a small emf because the coil’s motion

Which device operates by electromagnetic induction between two coils with varying current in one coil creating a changing flux in the other?

Which device regularly converts mechanical rotation into an alternating induced emf?

Which rule helps determine the direction of induced current in a generator?

In a simple dynamo the purpose of the commutator is to

A loop of wire is moved such that the angle between its plane and a uniform magnetic field changes. Which factor does NOT affect the induced emf?

Which effect explains why a current in a wire inside a magnetic field can cause a force on the wire (motor action)?