Question

in the following circuit , a metre bridge is shown in its balanced state. the bridge wire has a resistance of 1 ohm/cm. calculate the value of the unknown resistance X connected in the left gap when 3 ohm resistor is connected in the right gap and the current drawn from the battery ofnegligibleinternal resistance. [2ohm , 1.26A]

Answer 1

thebbqlue of x will be 1000

Answer 2

From the principle of wheatstone bridge:X40=360Hence,X=12060   = 2 ohmsCurrent:Combination of resistances=2+3=5 ohmsResistance of the bridge wire=100×1=100 ohmsTotal resistance=100×5105                              =500105  ohmsI=VoltageTotal resistance  =6500'105  =630500  =1.26 A