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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 steady eletric current is flowing through a cylindrical wire

$(a)$ the electric field at the axis of wire is zero
$(b)$ the magnetic field at the axis of wire is zero
$(c)$ the electric field in the vicinity of wire is Zero.
$(d)$ the magnetic field in the vicinity of wire is Zero

  • A
    $a,b,c$
  • ✓
    $b,c$
  • C
    only $c$
  • D
    only $b$
✓

Answer

Correct option: B.
$b,c$
b
If a wire carry steady current then electric field will exist inside the wire but electric field outside the wire as zero.

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