The main disadvantage of having a small focal spot on an X ray tube is:

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Q. The main disadvantage of having a small focal spot on an X ray tube is:

(A) Heat is conducted away too fast
(B) Sharper radiographic images may be achieved with a larger focal spot
(C) A smaller focal spot is limited to lower tube currents because of the potential damage from overheating
(D) None of the above

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✅ Correct Answer: (C) A smaller focal spot is limited to lower tube currents because of the potential damage from overheating

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