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Moving Charges and Magnetism — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
MCQ
A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance the magnetic field at P is:
  • A
    Greater than at Q.
  • B
    Same as at Q.
  • C
    Less than at Q.
  • D
    Greater or less than at Q depending upon the strength of current.
✓

Answer

  1. Same as at Q.

Explanation:

As per Biot Savart Law, Magnetic field at a point is inversely proportional to square of distance from the current carrying conductor.

Therefore magnitude of magnetic field is same at both points P and Q, irrespective of their position from the conductor.

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