A student plays a guitar and notices that altering the tension in one of the strings alters the frequency of the note played. The student thinks that this happens because the speed of the wave has changed. 1 Plan an investigation which will determine if the speed of the wave in a wire is related to the tension (stretching force) in that wire.
Your plan should include: • an equipment list • a risk assessment • a method • a table for results.

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?