To calculate resistance with changing cross-section, you can use the formula for resistance, which is R = ρ * L / A, where R is resistance, ρ is the resistivity of the material, L is the length of the conductor, and A is the cross-sectional area of the conductor. If the cross-section changes along the length of the conductor, you would need to calculate the resistance for each segment with its corresponding cross-sectional area and length, and then sum up the resistances of all segments to get the total resistance. This can be done by breaking down the conductor into smaller segments with uniform cross-sections and calculating the resistance for each segment separately. **

To calculate the cable cross-section, you need to know the diameter of the cable. Once you have the diameter, you can use the formula for the area of a circle (A = πr^2) to calculate the cross-sectional area of the cable. Simply divide the diameter by 2 to get the radius, then square the radius and multiply by π to get the cross-sectional area. This will give you the size of the cable cross-section in square units (e.g. square millimeters or square inches). **

No, it is not a cross-section. **

A cross-section is a two-dimensional representation of a three-dimensional object that is created by cutting the object perpendicular to its longest axis. It provides a view of the internal structure of the object. On the other hand, a longitudinal section is a two-dimensional representation of a three-dimensional object that is created by cutting the object parallel to its longest axis. It provides a view of the internal structure of the object along its length. Both types of sections are commonly used in fields such as anatomy, engineering, and geology to study the internal structure of objects. **

A conductor cross-section refers to the area of a conductor that is perpendicular to the direction of current flow. It is typically measured in square millimeters or square inches and is an important factor in determining the current-carrying capacity of a conductor. A larger cross-section allows for more current to flow through the conductor without overheating. Conductors with larger cross-sections are often used in applications where high currents are expected, such as in power transmission lines. **

A rectangular cross-section is a shape that has four sides, with opposite sides being equal in length and parallel to each other. The angles between the sides are all right angles (90 degrees). This shape resembles a rectangle when viewed from the side. **

A square cross-section is a shape that is formed when a solid object, such as a beam or column, is cut perpendicular to its length, resulting in a square-shaped face. This means that all four sides of the cross-section are of equal length and all four angles are right angles. **

The Compton cross section is a measure of the probability of a photon interacting with an electron through the Compton scattering process. It represents the likelihood of a photon being scattered by an electron at a given angle and energy. The Compton cross section is an important quantity in understanding the interaction of photons with matter and is used in various fields such as medical imaging, astrophysics, and particle physics. It is a fundamental parameter in the study of the behavior of photons and electrons in matter. **