Which one is used as dielectric in tantalum capacitors?

Q. Which one is used as dielectric in tantalum capacitors?
A. Niobium pentoxide
B. Manganese dioxide
C. Tantalum pentoxide
D. All of the above
Answer: All of the above

A. Niobium pentoxide
B. Manganese dioxide
C. Tantalum pentoxide
D. All of the above
Answer: All of the above