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Hi!

I looked at the upper part of the solenoid from top-down and found that the currents going in were pointing into the page (Since the magnetic field was downwards, and the force leftward). Hence the current in the solenoid looking from the direction of the loudspeaker was clockwise so it was...

Likewise, B. It was a generator because a mechanical force is applied by pushing the speaker in. I then used Fleming's generator rule and found that the solenoid induced a current clockwise, implying a Y->X current.

30a? The energy firstly has to come from somewhere. Since the brick falls to the ground, its elevation is changing. This means that the energy comes from gravitational potential energy. Maximum energy = (Egpe at initial altitude) - (Egpe at initial altitude - 1 metre) Maximum energy =...