electric current-potentiometer

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the diagram shows a metre with the wire 'AB' having uniform resistance per unit length.when the switch 'S' is open, AJ is the balance length and when the switch is closed, AJ' is the balance length. is AB = 4 m and AJ = 2m then what is the value of AJ' .??

answer is 3m.. pls help!

#Physics #Electricity and magnetism

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