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Moving Charges and Magnetism question

2007 · Q113
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Moving Charges and Magnetism question

2007 · Q113

NEETPhysicsMoving Charges and MagnetismMCQ+4 / −1
The resistance of an ammeter is 13 Ω\OmegaΩ and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is
  1. A
    2 Ω\OmegaΩ
  2. B
    0.2 Ω\OmegaΩ
  3. C
    2 kΩ\OmegaΩ
  4. D
    20 Ω\OmegaΩ
View written solutionFree

Correct answer: A

We know

IIS=1+GS{I \over {{I_S}}} = 1 + {G \over S}IS​I​=1+SG​

750100=1+13S{{750} \over {100}} = 1 + {{13} \over S}100750​=1+S13​

⇒S=2Ω\Rightarrow S = 2\Omega⇒S=2Ω

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