Experiment of December 7, 2018:
The time to submit an answer is over. You can now view the solution of the experiment.
What does Ms. Santa observe?
A) She measures a magnetic field with constant polarity, always in the same direction
B) She measures a magnetic field with constant polarity, this is strongest in x direction
C) She measures a magnetic field with alternating polarity, this is strongest in y direction
D) She measures a magnetic field with alternating polarity, with always changing direction
Advice of the day:
The "Direction" refers to the x-, y- or z-axis of the telephone or the loop from the aluminium conductor strip. A change of direction therefore means that we observe a field once in the x-direction and once in the y-direction. "Polarity" means that the measured magnetic field shows one positive and one negative deflection. If you do not have a smartphone with a magnetic field sensor, you could also use a small (children's) compass. The rotating needle shows both the direction (x, y or z) and the sign (tip or end of the needle).