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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 · Q103 of 120

Geo-Scientist Prelims 2020 General Studies Q103: Which one of the following statements is correct regarding the…

QuestionPhysics / magnetism

Which one of the following statements is correct regarding the magnetic field inside a current carrying solenoid?

  1. (a) The magnetic field inside the solenoid is zero
  2. (b) The magnetic field inside the solenoid is uniform at all the points
  3. (c) The magnetic field inside the solenoid increases as we move towards the ends
  4. (d) The magnetic field inside the solenoid decreases as we move towards the ends

Answer: (b) The magnetic field inside the solenoid is uniform at all the points

Inside a long solenoid B = μ₀nI, uniform at all points (parallel field lines). Near the ends it falls to about half. Textbook answer: uniform → (b).

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