In the diagram, a force of 20 newtons is applied to a block. the block is in dynamic equilibrium. what is the magnitude and direction of the frictional force
a. 20 newtons in the direction of the applied force
b .20 newtons opposite to the direction of the applied force
c. 20 newtons perpendicular to the direction of the applied force
d. 20 newtons in two directions, perpendicular and in the direction of the applied force
e. no friction is acting on the block.

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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