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Moving Charges and Magnetism — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
MCQ
A steady electric current is flowing through a cylindrical conductor.
  • A
    The electric field at the axis of the conductor is zero.
  • B
    The magnetic field at the axis of the conductor is zero.
  • C
    The electric field in the vicinity of the conductor is zero.
  • D
    The magnetic field in the vicinity of the conductor is zero.
✓

Answer

  1. The magnetic field at the axis of the conductor is zero.
  2. The electric field in the vicinity of the conductor is zero.

Explanation:

As the current is flowing through a conductor so it it is distributed only on the surface of the conductor not in the volume of the cylindrical conductor. It is equivalent to charge distribution on a cylindrical sheet for which electric field inside a conducting cylindrical sheet is always zero.

Magnetic fields at any point inside the conducting cylinder is proportional to the distance from the axis of the cylinder.

At the axis, r = 0.

This implies that field will be zero at the axis.

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