Question

in the diagram shown below, the cell and the ammeter both have negligible resistance . the resistors are identical with the switch k open ,the ammeter reads 0.6 A . what will be the ammeter reading when the switch is closed .❤❤❤❤❤❤​

Answer 1

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Answer 2

Ammeter reading when switch is closed is 0.9 A.

Given:

When switch is open, Ammeter reading is 0.6 A.

To find:

Ammeter reading when switch is closed is 0.9 A.

Solution:

When switch is open:

From the figure of switch is open, we can say that

i₁ = $\frac{E}{r}$  and i₂ = $\frac{E}{r}$

Since it is parallel, i = i₁ + i₂

⇒ i = $\frac{E}{r} + \frac{E}{r}$ = $\frac{2E}{r}$

⇒ 0.6 = $\frac{2E}{r}$  ⇒ $\frac{E}{r} = 0.3A$

When switch is closed:

Since switch is closed, i = i₁ + i₂ + i₃

⇒ i = $\frac{E}{r} + \frac{E}{r} + \frac{E}{r} = \frac{3E}{r}$

⇒ i = 3 x 0.3 = 0.9 A

Hence Ammeter reading when switch is closed is 0.9 A.

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