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Recent solved doubts

Physics
Q: Why is electric field inside a conductor zero?
A: Charges rearrange till internal field cancels the external field ⇒ net E=0 inside.
Chemistry
Q: Order of basicity: aniline, p-toluidine, p-nitroaniline?
A: −I/−M of NO₂ reduces, +I of CH₃ increases; so p-toluidine > aniline > p-nitroaniline.
Maths
Q: If f is continuous at x=a, prove limx→af(x)=f(a).
A: From ε–δ continuity definition: ∀ε>0 ∃δ … |x−a|<δ ⇒ |f(x)−f(a)|<ε.

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