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Which of the following statements about electric precipitators is false?

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Which of the following statements about electric precipitators is false?

(a) They are used to remove dust by providing a strong electric field

(b) Their initial installation cost is high

(c) Their operational cost is low

(d) Dust particles get attached to the positive electrode

I have been asked this question in an interview for job.

The question is from Systems and Essentials of Air Conditioning System topic in portion Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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The correct choice is (d) Dust particles get attached to the positive electrode

The best I can explain: Electric precipitators are used to remove dust by providing a strong electric field. In an electric precipitator, the dust particles get attached to the negative electrode. Their initial installation cost is high but their operational cost is low.

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