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Electromagnetic TheoryMagnetic Field

The direction of magnetic field around a long straight current-carrying conductor is determined by the?

  • ARight-hand rule
  • BLeft-hand electrostatic rule
  • CLenz law only
  • DGauss electric law only
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Correct Answer: A. Right-hand rule
Explanation: Curling the fingers of the right hand around the conductor with the thumb along current gives the magnetic-field direction.
Reference: Standard electromagnetic theory: magnetic field
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