JEE Main 2026 — Jan 28, Shift 2 — Physics solution

JEE Main2026Jan 28, Shift 2Physics

Identify the correct statements :

A. Effective capacitance of a series combination of capacitors is always smaller than the smallest capacitance of the capacitor in the combination.

B. When a dielectric medium is placed between the charged plates of a capacitor, displacement of charges cannot occur due to insulation property of dielectric.

C. Increasing of area of capacitor plate or decreasing of thickness of dielectric is an alternate method to increase the capacitance.

D. For a point charge, concentric spherical shells centered at the location of the charge are equipotential surfaces.

Choose the correct answer from the options given below.

A
A, B and C only
B
C and D only
C
A, C and D only
D
B and D only

Solution

A. In series, $\frac{1}{C _{e q}} = \frac{1}{C _{1}} + \frac{1}{C _{2}} + \dots$ , so $C_{e q}$ is smaller than every individual capacitance — TRUE.

B. In a dielectric, bound charges undergo polarisation (small displacement) even though no free conduction occurs — FALSE.

C. $C = \frac{ε _{0} ε _{r} A}{d}$ . Increasing $A$ or, when the dielectric fully fills the gap, reducing thickness — both raise $C$ . TRUE.

D. Field of a point charge is radial; concentric spheres are perpendicular to it and thus equipotential — TRUE.

Correct: A, C, and D.

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