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

A step-up transformer increases voltage because

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

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

A coil with 200 turns experiences a magnetic flux change of 0.12 Wb in 0.030 s. What is the magnitude of the average induced emf?

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

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

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

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?

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