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QJEEM18Pha375: JEE Main 2018 Physics - Class 12 JEEM18Pha375 Solution: A galvanometer with its coil resistance 25 Ω requires a current …

A galvanometer with its coil resistance 25 Ω requires a current of 1 mA for its full deflection. In order to construct an ammeter to read upto a current of 2 A, the approximate value of the shunt resistance should be :

Multiple Choice Options

  • A 2.5×10−3Ω
  • B 1.25×10−2Ω
  • C 1.25×10−3Ω
  • D 2.5×10−2Ω

Step-by-Step Verified Solution

JEE Main 2018 (Online) 16th April Morning Slot Physics - Current Electricity Question 284 English Explanation

Given,

Ig = 1 ma

I − Ig = 2 A

Rg = 25 Ω

∴ Ig Rg = (I − Ig) S

⇒ S = 10−3×252

⇒ S = 1.25 × 10−2 Ω

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