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The sensation felt when touching a doorknob after rubbing a shoe on a carpet is a result of static electricity shock. This phenomenon occurs due to the buildup of electric charge on the surface of objects, which can happen through processes such as friction. When you rub your shoe on the carpet, electrons are transferred from one surface to another, causing you to accumulate an excess of electric charge.

When you then touch a doorknob, which is a conductor, the stored electric charge discharges quickly, and this sudden flow of electricity is felt as a shock. This is a common experience during dry conditions when the air is less conductive, leading to a greater accumulation of static charge.

The other types of electricity mentioned in the choices do not apply in this context: current electricity refers to the flow of electric charge through a conductor in a circuit, voltage shock relates to the potential difference causing current to flow, and magnetic shock is not a recognized electrical phenomenon in this context. Thus, the sensation experienced in this scenario is accurately described as a static electricity shock.