Step 5: Thought Experiment! Is it possible for the magnetic field to change so fast that you wouldn't see it change with your naked eye? Which slider would you have to change to make that possible? Please explain your answer in at least two complete sentences. If you can mention exactly how fast the magnetic field must change to be imperceptible to the human eye at least two complete sentences.

Two long wires carry 10 A currents in the directions shown in the figure (Figure 1). One wire is 20 cm above the other. 1.  What is the magnitude of the magnetic field at a point halfway between them?  Express your answer with the appropriate units. 2. What is the direction of that magnetic field? A. Downward and to the right, at an angle of 45∘ from both wires. B. Upward and to the left, at an angle of 45∘ from both wires. C. Upward and to the right, at an angle of 45∘ from both wires. D. Downward and to the left, at an angle of 45∘ from both wires.

a) What is the magnetic field strength of the earth? How does this compare to themagnetic field strength of a bar magnet? b) How does the strength of an electromagnet compare to the strength of the bar magnet? c) Give 2 advantages of electromagnets over a bar magnets?