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Consider the MB shown in the diagram, le...


Consider the MB shown in the diagram, let the resistance X have temperature coefficient `alpha_(1)` and the resistance from the RB have the temperature coefficient `alpha_(2)`. Let the reading of the meter scale be 10 cm from the LHS. if the temperature of the two resistance increase by small temperature `DeltaT` then what is the shift in the position of the null point ? Neglect all the other changes in the bridge due to temperature rise.

A

`9(alpha_1 - alpha_2)Delta T`

B

`9 (alpha_1 +alpha_2 ) Delta T`

C

`1/9 (alpha_1 + alpha_2 ) Delta T`

D

`1/9(alpha_1 - alpha_2) Delta T`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The positive temperature coefficient of resistance is for

    A
    Carbon
    B
    Germanium
    C
    Copper
    D
    An electrolyte

  • The solids which have the negative temperature coefficient of resistance are:

    A
    Insulators only
    B
    Semiconductors only
    C
    Insulators and semiconductors
    D
    Metals

  • The temperature coefficient of resistance of a semiconductor

    A
    Is always positive
    B
    Is always negative
    C
    Is zero
    D
    May be positive or negative or zero

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