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NEET 2018
Exam
NEET
Year
2018
Subject
Physics
Chapter
Current Electricity

NEET 2018 · Physics · Current Electricity

Current sensitivity of a moving coil galvanometer is 5div / mA and...

Current sensitivity of a moving coil galvanometer is 5div/mA5div / mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20div/V20div / V. The resistance of the galvanometer is

Options

  1. A250Ω250Ω
  2. B25Ω25Ω
  3. C40Ω40Ω
  4. D500Ω500Ω

Correct answer

A. 250Ω250Ω

Step-by-step solution

θi=5010−3=5000,θV=20\dfrac{\theta}{i} = \dfrac{50}{{10}^{- 3}} = 5000, \dfrac{\theta}{V} = 20

⇒θ/iθ/V=500010=250⇒Vi=R=250Ω⇒ \dfrac{\theta / i}{\theta / V} = \dfrac{5000}{10} = 250 ⇒ \dfrac{V}{i} = R = 250Ω

(∵Voltage sensitivity =current sensitivityResistance)( ∵ \text{Voltage sensitivity =}\dfrac{\text{current sensitivity}}{\text{Resistance}} )
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