Magnetic Forces - Magnetic Field from Current Loops

Question 1

current loops

Answer 1

• current in the loop is the medium via which the sensor signal is transmitted. The current flowing through the transmitter is proportional to the input signal being measured. When calibrated properly, this current will vary from 4 to 20mA over the range of its sensor input signal.
• create a magnetic dipole

Question 2

earth’s field

Answer 2

• cause by current loops in the core

Question 3

permanent magnets

Answer 3

• electron spins line up, B’s add