2 Figure 1 shows the structure of a dynamic microphone. - Figure 1 Figure 2 coil of wire N diaphragm 11agnets S sound waves to electrical circuit a) Figure 2 shows an end view of the permanent magnet inside of the microphone. Complete Figure 2 by drawing the magnetic field lines for the microphone. 12] b) Explain how the microphone converts sound waves to electrical signals. need help with question b

where is the photo and the answer choices?

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia