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A galvanometer having a resistance of 50...

A galvanometer having a resistance of `50Omega` , gives a full scale deflection for a current if `0.05` A. The length in metre if a resistance wire of area of cross- section `2.97 xx10^-2cm^2` that can be used to convert the gaivanometer into an ammeter which can read a maximum of 5 A current is (specific resistance of the wire =`5xx10^-7Omega-m`)

A

9

B

6

C

3

D

1.5

Text Solution

Verified by Experts

The correct Answer is:
C
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A galvanometer having a resistance of son, gives a full scale deflection for a current of 0.05 A. The length in metre of a resistance wire of area of cross section 2.97 xx 10^(-2) cm^(2) that can be used to convert the galvanometer into an ammeter which can read a maximum of 5A current is ( specific resistance of the wire = 5 xx 10^(-7) Omega - m

A galvanometer having a resistance of 50Omega , gives a full scale deflection for a current of 0.05A. What is the length (in metre) of a resistance wire of area of cross-section 2.97xx10^(-2)cm^(2) that can be used to convert the galvanometer into an ammeter which can read a maximum of 5A current? (Specific resistance of the wire =5xx10^(-7)Omega -m)

Knowledge Check

  • An ammeter whose resistance is 180 Omega gives full scale deflection when current is 2 mA. The shunt required to convert into an ammeter of reading 20 mA (in ohm).

    A
    18
    B
    20
    C
    0.1
    D
    10

  • An ammeter whose resistance is 180 Omega shows full scale deflection when the current is 2 mA. The shunt required to convert into an ammeter reading 20mA is (in ohm )

    A
    18
    B
    20
    C
    `0.1`
    D
    10

  • A galvanmeter has a resistance of 50Omega and a current of 0.01 A will cause full scale deflection . To converted this into an ammeter with full deflection for 5A , we have to connect approximately

    A
    `0.1Omega` in series
    B
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    C
    `0.2Omega` in series
    D
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