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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 16 March 2021, Shift 2, Physics Q27

Question 27 of 90 in this shift, Physics question 27 of 30, Section B.

In a parallel plate capacitor set up, the plate area of capacitor is 2 m22\ \mathrm{m^2} and the plates are separated by 1 m. If the space between the plates are filled with a dielectric material of thickness 0.5 m and area 2 m22\ \mathrm{m^2} (see fig) the capacitance of the set-up will be ________ εo\varepsilon_o. (Dielectric constant of the material = 3.2) (Round off to the Nearest Integer)

The figure, in words

Parallel plates separated by distance d; dielectric slab of constant k and thickness d/2 fills half the gap, adjacent to one plate.

Official answer

3

NTA final key.

Chapter
Electrostatic Potential and Capacitance
Topic
Parallel Plate Capacitors
Idea tested
Partially Filled Dielectric Slab

Same idea in other shifts

Asked 2× in all
  1. 26 Jun 2022, Shift 2 · Q39A parallel plate capacitor with plate area A and plate separation d=2 m has a capacitance of 4 μF4\ \mu F. The new capacitance of the system…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. 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.