Two point charges are arranged in a straight line with a point labeled P. The point charges are 9; = 30 x 10-6C and q2 = -20 x 10-6C. Charge q; is 0.20 m from charge q2, and charge q2 is 0.30 m to the left of point P. Determine the magnitude of the net electric field at point P. Give your answer as
a whole number
20 cm
30 cm
Free-body diagram
E,
The magnitude is
NC.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it