Induced Potential (ht Only) (GCSE Physics)

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

A straight wire of length L moves with velocity v through a magnetic field B so that v, L and B are mutually perpendicular. The induced emf equals

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

Which practical application relies on induced emf when a conductor cuts magnetic field lines and produces a usable voltage for charging?

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

A coil is connected to a lamp. Rotating the coil faster in a magnetic field makes the lamp brighter because

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

A single-turn conducting loop in a changing magnetic field has an induced emf of 0.50 V. If the same changing field acts on a coil of 500 identical turns, the induced emf in that coil will be

In a simple dynamo the purpose of the commutator is to

A single straight wire of length 0.3 m is moved at 2 m/s through a 0.5 T field producing 0.30 V induced emf. If the wire length doubled to 0.6 m with same speed and field, the induced emf becomes

A loop cuts magnetic field lines so the magnetic flux through it decreases. Which is true about the induced current?