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Magnetic Effect of Current — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsMagnetic Effect of Current1 Mark
MCQ
A moving coil galvanometer has resistance $50\,\Omega $ and it indicates full deflection at $4\,mA$ current. A voltmeter is made using this galvanometer and a $5\,k\Omega $ resistance. The maximum voltage, that can be measured using this voltamenter, will be close to ......$V$
  • A
    $15$
  • B
    $20$
  • C
    $10$
  • D
    $40$
✓

Answer

$G=50\, \Omega$

$\mathrm{S}=5000 \,\Omega$

$\mathrm{I}_{\mathrm{g}}=4 \times 10^{-3}$

$\mathrm{V}=\mathrm{i}_{g}(\mathrm{G}+\mathrm{S})$

$V=4 \times 10^{-3}(50+5000)$

$=4 \times 10^{-3}(5050)=20.2$ $volt$

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