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NEET-XII-Physics

04: Moving Charges And Magnetism

 page 5
Qstn# 28 Prvs-Qstn
  • #28
    A galvanometer coil has a resistance of 15 ``\Omega`` and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?
    Ans : Resistance of the galvanometer coil, G = 15 ``\Omega``

    Current for which the galvanometer shows full scale deflection,

    = 4 mA = 4 × 10-3 A

    Range of the ammeter is 0, which needs to be converted to 6 A.

    Current, I = 6 A

    A shunt resistor of resistance S is to be connected in parallel with the galvanometer to convert it into an ammeter. The value of S is given as:



    Hence, a shunt resistor is to be connected in parallel with the galvanometer.