Discussion
Match each proposed charging mechanism with its description.
List I
A. Non-inductive
B. Inductive
C. Convective
D. Selective ion capture
List II
1. ions swept up and carried by air motion
2. charge transfer on rebounding ice collisions
3. particles preferentially capturing one ion sign
4. polarised particles exchanging charge in a field
Answer: B
The non-inductive mechanism is regarded as dominant, with the others contributing at various stages. Inductive charging can only act once a field already exists. The mechanisms therefore operate in a definite sequence.
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