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When a glass rod is rubbed with silk, the glass rod becomes positively charged because:
AProtons transfer from silk to glass
BElectrons transfer from glass to silk (since electrons are mobile; protons are bound in nuclei)
CBoth protons and electrons transfer
DNo charge transfer occurs
Answer & Solution
Correct answer: B. Electrons transfer from glass to silk (since electrons are mobile; protons are bound in nuclei)
Only **electrons** are mobile in solids (protons are bound in nuclei). Glass rod → loses electrons to silk → glass becomes **positive**, silk becomes **negative**. Total charge of (glass + silk) remains zero — conservation.
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