Which current is known to cause a painful shock but is still manageable for a brief time?

The correct choice regarding a current that can cause a painful shock but is manageable for a brief time is 30 mA. At this level, the electrical current can induce a painful sensation that may lead to muscle contraction and a strong shock feeling, but it is generally within a range that a person might be able to withstand for a short period.

When dealing with electrical shock, it's important to understand that the effects of current on the human body become more severe with increased amperage. At 10 mA, individuals may feel a minor shock, while currents above 30 mA have a higher potential to affect involuntary muscle contractions, making it difficult to let go of the source of the shock. Higher currents, such as 50 mA and 75 mA, can lead to more serious injuries or potentially fatal outcomes, making them less manageable and far more dangerous than 30 mA.

Thus, 30 mA is the threshold recognized for painful but usually temporary shocks where individuals may still have some control over their response, although it is still hazardous and one should always avoid exposure to any level of electric current whenever possible.