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Magnetic Fields (GCSE Physics)

The following is a GCSE Physics test covering 'Magnetic Fields' from the broader topic Magnetism And Electromagnetism. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

When a coil in a magnetic field is rotated, the induced emf changes sign every half turn. Which type of current does the coil alone produce (before a commutator)?
Which material makes the best core for an electromagnet used in a transformer to increase magnetic field strength?
A student measures force on a wire: F = 0.65 N, current I = 2.0 A, length of wire in field L = 0.10 m. What is the magnetic flux density B?
Which arrangement will produce the strongest magnetic field outside a bar magnet?
Which of the following is a correct way to strengthen the magnetic field produced by an electromagnet?
What does a commutator do in a simple dynamo or DC generator?
Which property makes soft iron a suitable core for electromagnets used in transformers and relays?
Which of these will increase the voltage induced in a coil moved through a magnetic field?
Which change will increase the magnetic field strength inside a solenoid?
A teacher demonstrates induction by moving a magnet into a coil connected to an ammeter; the needle deflects while the magnet moves and returns to zero when stationary. What principle does this show?
Which statement about electromagnetic induction is correct?