By what things the positive pole of dry battery is made??

it varies with the type of battery. In most cases, the positive pole is a portion of a steel (or nickel) case surrounding chemicals. See each battery here, left column links: https://www.electrical4u.com/mercuric-oxide-battery-chemistry-construction-advantages-uses/

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The positive pole of a dry battery is typically made from a material called carbon-zinc. To understand how the positive pole is made, we need to explain the construction of a dry battery.

A dry battery is also known as a zinc-carbon battery. It consists of a zinc metal casing acting as the negative terminal and a carbon rod acting as the positive terminal, separated by an electrolyte paste. The electrolyte paste is a mix of manganese dioxide and ammonium chloride.

To form the positive pole of the battery, the carbon rod is inserted into the battery casing, and the space between the carbon rod and casing is filled with the electrolyte paste. The carbon rod, or positive pole, serves as a good conductor of electricity due to its high carbon content.

Carbon is chosen as the material for the positive pole because it has good electrical conductivity and can withstand the chemical reactions that occur during battery discharge. The carbon rod provides a stable interface for the transfer of electrons between the battery's internal chemistry and the external circuit, allowing the flow of electric current.

So, in summary, the positive pole of a dry battery is made from a carbon rod that provides a conductive surface for the transfer of electrons and allows the flow of electric current.