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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 17 March 2021, Shift 1, Physics Q23

Question 23 of 90 in this shift, Physics question 23 of 30, Section B.

Four identical rectangular plates with length, l=2l=2 cm and breadth, b=32b=\frac{3}{2} cm are arranged as shown in figure. The equivalent capacitance between A and C is xε0d\frac{x\varepsilon_0}{d}. The value of xx is __________. (Round off to the Nearest Integer)

The figure, in words

Four vertical parallel plates labelled A, B, C, D from left to right, with equal gaps each marked d between consecutive plates (A-B, B-C, C-D). Plates B and D are joined by a wire drawn over the top (a horizontal line connecting the tops of B and D); A and C are not joined to it.

Official answer

2

NTA final key.

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

Same idea in other shifts

Asked 17× 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. 5 Apr 2024, Shift 1 · Q54Three capacitors of capacitances 25 μF25\ \mu\mathrm{F}, 30 μF30\ \mu\mathrm{F} and 45 μF45\ \mu\mathrm{F} are connected in parallel to a supply of…MediumNumerical value
  3. 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
  4. 6 Apr 2023, Shift 2 · Q59As shown in the figure, two parallel plate capacitors having equal plate area of 200 cm2^2 are joined in such a way that a≠ba \neq b. The…MediumNumerical valueHas a figure
  5. 10 Apr 2023, Shift 1 · Q41The equivalent capacitance of the combination shown isMediumDiagram basedHas a figure
  6. 11 Apr 2023, Shift 2 · Q60In the given circuit, C1=2 μF,C2=0.2 μF,C3=2 μF,C4=4 μF,C5=2 μF,C6=2 μF\mathrm{C_1 = 2\ \mu F, C_2 = 0.2\ \mu F, C_3 = 2\ \mu F, C_4 = 4\ \mu F, C_5 = 2\ \mu F, C_6 = 2\ \mu F}, The…HardNumerical valueHas a figure
  7. 15 Apr 2023, Shift 1 · Q55In the given figure the total charge stored in the combination of capacitors is 100 μ\muC. The value of 'xx' is ______________.EasyNumerical valueHas a figure
  8. 26 Jul 2022, Shift 1 · Q41The total charge on the system of capacitors C1=1 μC_1 = 1\ \muF, C2=2 μC_2 = 2\ \muF, C3=4 μC_3 = 4\ \muF and C4=3 μC_4 = 3\ \muF connected in parallel…EasySingle 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 108 of the 174 JEE Main shifts held from 2017 to 2026.