In the figure if the key S is closed the ratio between the reading of ammeter A2 to the reading of the ammeter A1 is

1:2

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1:3

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2:1

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1:1

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Solution

The correct option is C 2:1
When the current I starts from the battery, the ammeter A2 reads the current I.

As the current moves pass the ammeter it divides in branches equally as 0.5I and 0.5I. So the current reaching the ammeter A1 reads 0.5I
So A1 = 0.5I & A2 = I
A2 : A1 = ( I ) / ( I/2 )
= 2: 1

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figure (32-E4)

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In the figure if the key S is closed the ratio between the reading of ammeter A2 to the reading of the ammeter A1 is

The correct option is C 2:1When the current I starts from the battery, the ammeter A2 reads the current I. As the current moves pass the ammeter it divides in branches equally as 0.5I and 0.5I. So the current reaching the ammeter A1 reads 0.5I So A1 = 0.5I & A2 = I A2 : A1 = ( I ) / ( I/2 ) = 2: 1