JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 24 February 2021, Shift 1, Physics Q14

Question 14 of 90 in this shift, Physics question 14 of 30, Section A.

Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be :

(1) $1:2$
(2) $2:1$
(3) $4:1$
(4) $1:4$ Official answer

Official answer

Option 4

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

4 Apr 2026, Shift 2 · Q37From the circuit given below, the capacitance between terminals $A$ and $B$ shown in the circuit is ________ $\mu$ F. (take…MediumDiagram basedHas a figure
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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
6 Apr 2023, Shift 2 · Q59As shown in the figure, two parallel plate capacitors having equal plate area of 200 cm $^2$ are joined in such a way that $a \neq b$ . The…MediumNumerical valueHas a figure
10 Apr 2023, Shift 1 · Q41The equivalent capacitance of the combination shown isMediumDiagram basedHas a figure
11 Apr 2023, Shift 2 · Q60In the given circuit, $\mathrm{C_1 = 2\ \mu F, C_2 = 0.2\ \mu F, C_3 = 2\ \mu F, C_4 = 4\ \mu F, C_5 = 2\ \mu F, C_6 = 2\ \mu F}$ , The…HardNumerical valueHas a figure
15 Apr 2023, Shift 1 · Q55In the given figure the total charge stored in the combination of capacitors is 100 $\mu$ C. The value of ' $x$ ' is ______________.EasyNumerical valueHas a figure
26 Jul 2022, Shift 1 · Q41The total charge on the system of capacitors $C_1 = 1\ \mu$ F, $C_2 = 2\ \mu$ F, $C_3 = 4\ \mu$ F and $C_4 = 3\ \mu$ F 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.