b) A current of 20A flows through two ammeters A and B joined in series. The p.d. across A is 0.2V and that across B is 0.3V. Find how the same current will divide between A and B when they are joined in parallel.
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It will divide in ratio 3:2
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Given:
A current of 20A flows through two ammeters A and B joined in series. The p.d. across A is 0.2V and that across B is 0.3V.
To Find:
how the same current will divide between A and B when they are joined in parallel.
Explanation:
Rₐ = Vₐ / I = 0.2V/20 A
= 0.01Ω
Rₓ =0.3V/20A = 0.015Ω
Now Iₐ = Rₓ × I(Rₐ + Rₓ)
= 0.015×20A/(0.01 + 0.05)
=12A
Iₓ = I - Iₐ = 20-12 = 8 A
Answer = 8A
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