Question

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.

Answer 1

It will divide in ratio 3:2

Answer 2

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