Could someone me with my physics homework? there are a few problems i did not understand. even if you understand only one i would really appreciate it. they are attached as images. you so much.

Write the correct abbreviation for each metric unit

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.

Compare the patterns of the two waves shown in the image. which statement is true about these waves?