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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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