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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