After cleaning wire with a brush, how long until it is no longer in effect?

The correct answer is based on the time it typically takes for the cleaning effects of a wire brush to diminish after use. When cleaning wire, it is important to consider the surface properties and any residues or contaminants that may re-adhere to the wire after being cleaned.

In this case, about 20 minutes is a reasonable duration for the cleaned wire to remain effective in terms of maintaining cleanliness. During this time, the surface can remain free of contaminants that could affect performance in further applications. After this period, environmental factors such as exposure to dust, moisture, or other materials can lead to the recontamination of the wire surface, reducing its effectiveness.

The other options, while they represent short time frames, may not adequately account for the time it takes for potential contaminants to settle back on the cleaned surface. Hence, 20 minutes is a more suitable estimate for ensuring that the wire stays clean and effective for further use, making it the correct answer.