Find the magnitude of the magnetic flux through the floor of a house that measures 24 m by 13 m . assume that the earth's magnetic field at the location of the house has a horizontal component of 2.6×10−5 t pointing north, and a downward vertical component of 4.7×10−5 t .

14.6610^{-3}Wb

Explanation:

Magnetic flux through a surface is

Φ =BAcosθ

here, B is the magnetic field

A= area through which flux is measured

θ= angle measure between field direction and normal to the surface.

horizontal component of the field is parallel to the surface so the angle made by the normal with the field is 90° and thus flux due to horizontal component is 0 since cos 90 is 0.

in vertical component θ= 0°

Φ = BAcos0° = BA

= 4.7×10^{-5}×24×13 = 1466.4×10^{-5}= 0.01466 Wb = 14.6610^{-3}Wb

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