Sodium chloride consists of sodium ions of charge +e arranged in a crystal lattice with an equal number of chlorine ions of charge −e. The mass of each sodium ion is 3.82 × 10^-26 kg and that of each chlorine ion 5.89 × 10−26 kg. Suppose that the sodium ions could be separated into one pile and the chlorine ions into another.

What mass of salt would be needed to get 1.00 C of charge into the sodium ion pile and -1.00 C into the chlorine ion pile?

d eras and periods

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

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

e/c, where e is its total energy