Asubstance will take on the shape of an open container if it is a

A substance will take on the shape of an open container if it is a  Liquid.

Explanation:

The major state of matter are solid, liquid and gas. Liquid usually have a definite volume. Liquid take the shape of the container in which they contain. They are almost incompressible fluid so it is expected they conform to the shape of the container which they occupy.

Liquids have no definite shape . The particles in a liquid flows easily. The atoms or molecules of a liquid are bonded by intermolecular bonds. One example of a known liquid at room temperature is water.

Generally, liquid have a greater freedom of movement than solid. The molecules of a liquid is closely attach to each other.  

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

the components of a vector are the parts of the vectors that are to each other.

b perpendicular