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Conductivity and Resistivity

Seven resista...

Question

Seven resistances, each of value $20 Ω$ , are connected to a $2 V$ battery as shown in the figure. The ammeter reading will be

A

1 / 10 A

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B

3 / 10 A

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C

4 / 10 A

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D

7 / 10 A

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Solution

The correct option is C $4 / 10 A$
In the question seven resistors, each of resistance $20 Ω$ are connected in parallel to battery.
Current through each resistor $= \frac{2}{20} = \frac{1}{10} A$
Current through ammeter $= 4 \times \frac{1}{10} = \frac{4}{10} A$ .

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