(a) In a metre bridge [Fig.], the balance point is found to be at 39.5 cm from the end A, when the resistor Y is of 12.5 Ω. Determine the resistance of X. Why are the connections between resistors in a Wheat stone or meter bridge made of thick copper strips?(b) Determine the balance point of the bridge above if X and Y are interchanged.(c) What happens if the galvanometer and cell are interchanged at the balance point of the bridge? Would the galvanometer show any current?
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Solution
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xy=L1(100−L1)x=12.5L1=39.5L2=100−L1=60.512.5y=39.560.5 If x and y exchange yz=L1100−L1y12.5=39.560.5y=39.560.5×12.5=8.161
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Similar Questions
Q1
(a) In a metre bridge [Fig.], the balance point is found to be at 39.5 cm from the end A, when the resistor Y is of 12.5 Ω. Determine the resistance of X. Why are the connections between resistors in a Wheat stone or meter bridge made of thick copper strips?(b) Determine the balance point of the bridge above if X and Y are interchanged.(c) What happens if the galvanometer and cell are interchanged at the balance point of the bridge? Would the galvanometer show any current?
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Q2
What happens if the galvanometer and cell are interchanged at the balance point of the bridge? Would the galvanometer show any current? Please explain thoroughly.
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Q3
In the given circuit a metre bridge is shown in the balanced state. The metre bridge wire has a resistance of 1Ωcm−1. calculate the unknown resistance X and the current drawn from the is the battery of a negligible internal resistance if the magnitude of y is 6Ω . If at the balancing point. we interchange the position of the galvanometer and the cell, how it will affect the position of the galvanometer.
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Q4
Answer the following :
(a) Why are the connections between the resistors in a meter bridge made of thick copper strips?
(b) Why is it generally preferred to obtain the balance point in the middle of the meter bridge wire?
(c) Which material is used for the meter bridge wire and why?
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Q5
Write the principle on which the working of a metre bridge is based. In an experiment on meter bridge, student obtains the balance point at the point J such that AJ=40cm, as shown in figure. The values of R and X are both doubled and then interchanged. Find the new position of the balance point. If the galvanometer and battery are also interchanged how will the position of balance point be affected