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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 circular coil ‘$A$’ has a radius $R$ and the current flowing through it is $I$. Another circular coil ‘$B$’ has a radius $2R$ and if $2I$ is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e.${B_A}$ to ${B_B}$)
  • A
    $4:1$
  • B
    $2:1$
  • C
    $3:1$
  • ✓
    $1:1$
✓

Answer

Correct option: D.
$1:1$
d
(d) $B \propto \frac{i}{r}$

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