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KCET2023PhysicsMagnetic Effects of Current

A moving coil galvanometer is converted into an ammeter of range 0 to 5 ~mA . The galvanometer resistance is 90 and the shunt resistance has a value of 10 . If there are 5 0 divisions in the galvanometer-turned-ammeter on either sides of zero, its current sensitivity is

Options

  1. A2 10^4 div / A
  2. B1 10^5 ~A / div
  3. C2 10^4 ~A / div
  4. D1 10^5 div / A

Correct answer

D. 1 10^5 div / A

Step-by-step solution

Given, S=10 aligned & G=90 & i=5 10⁻³ ~A aligned Number of divisions on one side of zero =50i_g= S S+G i= ( 10 90+10 ) (5 10⁻³ )=5 10⁻⁴ ~A Number of divisions per unit current = 50 5 10⁻⁴ =1 10⁻⁵ div / A

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