Induced Potential (ht Only) (GCSE Physics)

If an induced current flows in a loop, the power dissipated as heat is I^2 R. To reduce heating losses for a given induced emf one should

Which statement best describes Faraday’s law of electromagnetic induction?

When a straight wire moves up through a magnetic field, a current is induced. Which energy conversion occurs?

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

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

In a simple dynamo the purpose of the commutator is to

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

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

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

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

When the magnetic flux through a coil is constant but the coil is deformed so its area decreases while still perpendicular to the field, the induced emf is