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| Q. |
Monopolar needle electrodes are having coatings of which material over the stainless steel wires which are bare only at the tips? |
| A. | carbon |
| B. | calcium |
| C. | sodium |
| D. | teflon |
| Answer» D. teflon | |
| Explanation: The monopolar needle electrode consists of a teflon coated stainless steel wire. The wire is bare only at the tip. It is found that after the needle has been used a number of times, the teflon coating will recede, increasing the tip area. The needle should be discarded when this happens. | |
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