Question

25. Two square plates of same material and thickness . If the ratio their length is 1 : 2 then what is the ratio of their resistances?
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Answer 1

Answer:

If I and d be length and thickness of plate A,,then

If I and d be length and thickness of plate A,,then➥RA=ρ*ℓ/a=ρℓ/ℓ×d=ρ/d

If I and d be length and thickness of plate A,,then➥RA=ρ*ℓ/a=ρℓ/ℓ×d=ρ/d➥and RB=ρ×2ℓ/2ℓ×d=ρ/d

If I and d be length and thickness of plate A,,then➥RA=ρ*ℓ/a=ρℓ/ℓ×d=ρ/d➥and RB=ρ×2ℓ/2ℓ×d=ρ/d∴RA/RB=1