Question
A cell is connected in the secondary circuit of a potentiometer and a balance point is obtained at 84 cm When the cell is shunted by a 5Ω resistor, the balance point changes to 70 cm. If the 5Ω resistor is replaced with 3Ω resistor then the balance point will be at
Answer: Option B
:
B
r=R[l1−l2l2]=R1[l1−l12l12]5[84−7070]=3[84−l12l12]l12×1414×3=84−l12l12+l123=844l12=84×3l12=63cm
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:
B
r=R[l1−l2l2]=R1[l1−l12l12]5[84−7070]=3[84−l12l12]l12×1414×3=84−l12l12+l123=844l12=84×3l12=63cm
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