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4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
A galvanometer is used in laboratory for the null point in electrical experiments. If, on passing a current of $6 \,m A$ it produces a deflection of $2^{\circ},$ its figure of merit is close to :
  • ✓
    $3 \times 10^{-3} A / div$
  • B
    $333^{\circ} A / div$
  • C
    $6 \times 10^{-3} A / div$
  • D
    $666^{\circ} A / div$
✓

Answer

Correct option: A.
$3 \times 10^{-3} A / div$
a
Figure of Merit $= C =\frac{ i }{\theta}$

$= C =\frac{6 \times 10^{-3}}{2}=3 \times 10^{-3} Am ^{2}$

 

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