The experiment examines the electric filed on the surface of plates covered uniformly with low-conducting coating. Each plate has imbedded over the coating a pair of high conducting shapes (electrodes). You will experiment with three configurations: two circles, a circle and a segment, and two parallel segments. Required:
Give a list of the three configurations in descending order of electric field uniformity in the area between the electrodes, i. e. first is the configuration with most uniform electric field, last is the one with least uniform electric field.

explanation:

could i give you a exaplo that could you?

c) up is the direction the magnetic force is acting on the charge.

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