Which will cause an electromagnetic solenoid to increase its strength? O
A. increasing the number of wire coils in the solenoid
B. replacing the wire with an insulator inside the solenoid
C. removing the iron core from the solenoid
O D. increasing the temperature surrounding the solenoid

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.