Induced Potential (ht Only) (GCSE Physics)

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

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

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

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

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

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 law gives the sign (direction) in Faraday’s law as emf = -N dF/dt?

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

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

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