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A galvanometer has a current sensitivity...

A galvanometer has a current sensitivity of 1 mA per division. A variable shunt is connected across the galvanometer and the combination is put in series with a resistance of `500Omega` and cell of internal resistance `1Omega`. It gives a deflection of 5 division for shunt of 5 ohm and 20 division for shunt of 25 ohm. The emf of cell is

A

50V, 100`Omega`

B

47.1V, 882` Omega`

C

68.4V, 23.4`Omega`

D

23.5V, 90.3 `Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
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A galvanometer having 50 divisions provided with a variable shunt S is used to measure the current when connected in series with a resistance of 90 Omega and a battery of internal resistance 10 Omega . It is observed that when the shunt resistances are 10 Oemga and 50 Omega , the deflections are, respectively, 9 and 30 divisions. What is the resistance of the galvanometer

A galvanometer vaving 50 divisions provided with a variable shunt S is used to measure the current when conneted in series with a resistance of 90 Omega and a battery of internal resistance 10 Omega . It is observed that when the snt resistaces are 10 Omega & 70 Omega respectively, the deflection are respectively 9 and 30 dividions. What is the resistance of the galvanometer ? Further, if the full scale deflection of the galvanometer movement require 200 mA. find the emf of the cell.

Knowledge Check

  • If the galvanometer current is 10 mA, resistance of the galvanometer is 40 Omega and shunt of 2 Omega is connected to the galvanometer, the maximum current which can be measured by this ammeter is

    A
    0.21A
    B
    2.1A
    C
    210A
    D
    21A

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