Roland writes a story in which boaters become stranded on a sandy island. in the story, they set about collecting materials to create semiconductors to repair computer components in their radio. which problem is likely to be the most difficult for roland’s characters to overcome? a) there are no semiconductor elements on the island. b) any substances they find are too impure. c) they lack materials to make a p-type semiconductor. d) no conductors are available to connect the components.

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.