A circular current with center O and radius R = 20 cm has a current of magnitude I1 = 10A flowing through it. a) Calculate the magnitude of the induction vector from B at center O.
b) An infinitely long straight current of magnitude I2 = 5A flows through center O and coincides with the axis
of the circular current I1. Calculate the magnitude of the magnetic induction vector B produced by two currents I1 and I2 at
point M lies on the straight current I2 and is a distance x = 20 cm from the center of O.

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

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."