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In post office box experiment, if Q/P=1/...

In post office box experiment, if `Q/P=1/(10)`. In (R ) if ` 142 Omega` is used then we get deflection towards right and if ` R =143 Omega` , then deflection is towards left. What is the range of unknown resistance?

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`P/Q = R/X`
`rArr X =(Q/P) R =(1/(10))R`
`R ` lies between `142 Omega` and `143 Omega`
There, the unknown resistance `X` lies between `14.2 Omega` and `14.3 Omega`.
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Knowledge Check

  • In a certain experiment if (Q)/(P) = (1)/(10) in R if 192Omega if used we are getting deflection toward right at 193Omega again toward rightr but at 194Omega deflection is toward left the unknown resistance should lie between .

    A
    `19.2` to `19.3Omega`
    B
    `19.3` to `19.4Omega`
    C
    `19` to `20.3Omega`
    D
    `19.4` to `19.5Omega`

  • In a meter bridge experiment the resistance of resistance box is 16 Omega which is inserted in right gap The null point is obtained at 36cm from the left end the least count of meter scale is lmm What is the value of unknown resistence ?( Error = L.C or L.C /2 )

    A
    `9 pm 5/128 Omega`
    B
    `9pm 5/256 Omega`
    C
    `9pm 5/512 Omega`
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    `128/9 pm 1/2560 Omega`

  • One of the circuits for the measurement of resistance by potentiometer is shown. The galvanometer is connected at point A and zero deflection is observed is observed at length PJ = 30 cm . In second case the secondary cell is changed. Take E_(s) = 10 V and r = 1 Omega in 1^(st) reading and E_(s) = 5 V and r = 2 Omega in 2^(nd) reading. In second case, the zero deflection is observed at length PJ = 10 cm . What is the resistance R (in ohm)?

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    B
    `2 Omega`
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    `3 Omega`
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