How do homogeneous mixture differ from heterogenous mixture? where does the compound table salt (nacl) fit into this description?

Difference between series and parallel circuits

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.

If the area of a square has increased by a factor of 16, by how much has each side increased?