Learn

Friday, 9 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 8 January 2020, Shift 1, Physics Q11

Question 11 of 75 in this shift, Physics question 11 of 25, Section A.

Effective capacitance of parallel combination of two capacitors C1C_1 and C2C_2 is 10 μ\muF. When these capacitors are individually connected to a voltage source of 1 V, the energy stored in the capacitor C2C_2 is 4 times that of C1C_1. If these capacitors are connected in series, their effective capacitance will be :
  1. (1)8.4 μ\muF
  2. (2)4.2 μ\muF
  3. (3)3.2 μ\muF
  4. (4)1.6 μ\muFOfficial answer

Official answer

Option 4

NTA final key (Jan 2020).

Chapter
Electrostatic Potential and Capacitance
Topic
Parallel Plate Capacitors
Idea tested
Series and Parallel Combinations

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2026, Shift 2 · Q37From the circuit given below, the capacitance between terminals AA and BB shown in the circuit is ________ μ\muF. (take…MediumDiagram basedHas a figure
  2. 9 Apr 2024, Shift 1 · Q40A capacitor is made of a flat plate of area A and a second plate having a stair-like structure as shown in figure. If the area of each…MediumSingle correctHas a figure

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