JEE Main 2019PhysicsCapacitanceHardMCQ

JEE Main 2019 — Capacitance Question with Solution

JEE Main 2019 (10 Jan Shift 1)

Question

A parallel plate capacitor is of area 6 cm2 and a separation 3 mm. The gap is filled with three dielectric materials of equal thickness (see figure) with dielectric constant K1=10, K2=12 and K3=14. The dielectric constant of a material which when fully inserted in above capacitor, gives same capacitance would be:

Choose an option

Show full solutionCorrect option: D
Correct answer
D12

Step-by-step explanation

C=∈0Ad

C1=K1∈0A3d=K1C3

C2=K2C3

C3=K3C3

C eq = K eq C= C 3 ( K 1 + K 2 + K 3 )

Keq=K1+K2+K33=363=12

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About this question

This is a previous-year question from JEE Main 2019, covering the Capacitance chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.