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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper I, General Studies · Q102 of 120

Geo-Scientist Prelims 2020 General Studies Q102: A straight conducting wire carries a DC current through it. Which…

QuestionPhysics / magnetism

A straight conducting wire carries a DC current through it. Which one of the following statements is true regarding the magnetic field around the wire?

  1. (a) The magnetic field does not depend upon the amount of current flowing through the wire
  2. (b) The magnetic field does not depend upon the distance from the wire
  3. (c) The magnetic field depends upon the material of the wire
  4. (d) The magnetic field decreases with an increase from the wire

Answer: (d) The magnetic field decreases with an increase from the wire

Field of a long straight wire: B = μ₀I/(2πr). It depends on current I and distance r, not on the wire material. B ∝ 1/r: it decreases with distance from the wire.

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