Ammeter from parallel to series, current change

Faris A
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Homework Statement


In the circuit shown, a student mistakenly connects a perfect ammeter(i.e. One of negligible resistance), in parallel with one of two identical resistors. The ammeter reads 0.40A.

What would the reading have been if he had correctly connected the ammeter in series with the two resistors? The cell also has negligible resistance.

Homework Equations


Relevant circuit (http://imgur.com/Uo6w6Um)

The Attempt at a Solution


I have no idea, the textbook says the answer is 0.20A but I have no idea why.
 
on Phys.org
Faris A said:
I have no idea,
Faris A said:
two identical resistors
Think about it.
 

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