JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 2 September 2020, Shift 2, Physics Q11

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

A 10

\mu

F capacitor is fully charged to a potential difference of 50 V. After removing the source voltage it is connected to an uncharged capacitor in parallel. Now the potential difference across them becomes 20 V. The capacitance of the second capacitor is :

(1)15 $\mu$ FOfficial answer
(2)30 $\mu$ F
(3)20 $\mu$ F
(4)10 $\mu$ F

Official answer

Option 1

NTA final key (Sep 2020).

Chapter: Electrostatic Potential and Capacitance
Topic: Parallel Plate Capacitors
Idea tested: Charge Sharing and Heat Loss

Same idea in other shifts

Asked 12× in all

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30 Jan 2024, Shift 1 · Q55A capacitor of capacitance C and potential V has energy E. It is connected to another capacitor of capacitance 2 C and potential 2 V. Then…MediumNumerical value
8 Apr 2023, Shift 2 · Q55A 600 pF capacitor is charged by 200 V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF…MediumNumerical value
11 Apr 2023, Shift 1 · Q41A parallel plate capacitor of capacitance 2 F is charged to a potential V, The energy stored in the capacitor is $E_1$ . The capacitor is…EasySingle correct
26 Jun 2022, Shift 1 · Q40Two capacitors having capacitance $C_1$ and $C_2$ respectively are connected as shown in figure. Initially, capacitor $C_1$ is charged to…EasyDiagram basedHas a figure
27 Jun 2022, Shift 1 · Q57A capacitor of capacitance 50 pF is charged by 100 V source. It is then connected to another uncharged identical capacitor. Electrostatic…EasyNumerical value
17 Mar 2021, Shift 2 · Q21A 2 $\mu$ F capacitor $\mathrm{C_1}$ is first charged to a potential difference of 10 V using a battery. Then the battery is removed and…EasyNumerical valueHas 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 108 of the 174 JEE Main shifts held from 2017 to 2026.