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Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyMulti-step

JEE Main 4 April 2025, Shift 2, Physics Q35

Question 35 of 75 in this shift, Physics question 10 of 25, Section A.

Three parallel plate capacitors C1C_1, C2C_2 and C3C_3 each of capacitance 5 μ\muF are connected as shown in figure. The effective capacitance between points A and B, when the space between the parallel plates of C1C_1 capacitor is filled with a dielectric medium having dielectric constant of 4, is :

The figure, in words

Circuit between A and B: C1 and C2 in series on the top branch; C3 on a parallel lower branch connecting A to B.
  1. (1)7.5 μ\muF
  2. (2)30 μ\muF
  3. (3)9 μ\muFOfficial answer
  4. (4)22.5 μ\muF

Official answer

Option 3

NTA final key.

Chapter
Electrostatic Potential and Capacitance
Topic
Dielectrics
Idea tested
Capacitance with Full Slab

Same idea in other shifts

Asked 2× in all
  1. 28 Jul 2022, Shift 1 · Q40Two capacitors, each having capacitance 40 μ\muF are connected in series. The space between one of the capacitors is filled with…MediumSingle correct

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 42 of the 174 JEE Main shifts held from 2017 to 2026.