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Electric Motors (ht Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Electric Motors (ht Only)' 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

What is the unit of magnetic flux density B in the SI system?
A motor’s torque is the turning moment produced. Which factors increase torque for a given motor design?
In the equation F = B I L, what does B represent?
In a simple DC motor, if the strength of the external magnetic field is doubled while other factors stay the same, what happens to the force on each side of the coil?
A rectangular coil in a uniform magnetic field experiences a turning effect (torque). Which change will increase the torque produced?
Why are laminated iron cores used in motor stators and rotors rather than solid iron?
What is “back EMF” in the context of a DC motor?
A motor has power input P_in and mechanical output power P_out. Which expression defines efficiency?
What happens to the current drawn by a DC motor when it is stalled (cannot rotate) compared with normal running?
In an electric motor, what is the role of the brushes?
Which material is typically used for the permanent magnets in small DC motors?