Help please :) ? Which material is used to magnetically screen electrical equipment from unwanted magnetic
fields?
A: aluminium
B : copper
C : iron
D :steel

Need this now! do pilots live long

What sort of waves exhibit the doppler effect?

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.