First slide

ammeter

Question

In the arrangement shown, initially switch S is open and reading of the ammeter is 2.5 A. What will be the reading of the ammeter after the switch S is closed?

Moderate

A

5 Amp
B

Zero
C

7.5 Amp
D

1.25 Amp

Solution

Initially $i_{1} = \frac{1}{2 R} = \frac{5}{R} Amp$
After S is closed, $i_{2} = \frac{10}{R} = \frac{10}{\frac{5}{i_{1}}} = 2 i_{1} = 2 \times 2.5 Amp \Rightarrow i_{2} = 5 Amp .$

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