Learn

Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumConceptual

JEE Main 3 September 2020, Shift 2, Physics Q13

Question 13 of 75 in this shift, Physics question 13 of 25.

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field B⃗\vec{B}. Then the field inside the paramagnetic substance is :

The figure, in words

A circle with a dot at its centre region, the dot labelled P.
  1. (1)much large than ∣B⃗∣|\vec{B}| and parallel to B⃗\vec{B}
  2. (2)much large than ∣B⃗∣|\vec{B}| but opposite to B⃗\vec{B}
  3. (3)zeroOfficial answer
  4. (4)B⃗\vec{B}

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Magnetism and Matter
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.