A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
Correct answer: A. one half
- A. one half
- B. double
- C. four times
- D. none of the above
Explanation
Cable capacitance is directly proportional to the insulation permittivity, with geometry unchanged. Changing the relative permittivity from 4 to 2 therefore halves the capacitance.
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