Physics Electrostatics Potential & Capacitance JEE Main 2025 - ( Capacitance ) MCQ (Single Correct)

A parallel plate capacitor has charge . A dielectric slab is inserted between the plates and almost fills the space between the plates. If the induced charge on one face of the slab is then the dielectric constant of the slab is .

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To find the dielectric constant K of the slab, we use the formula for the induced charge in a parallel plate capacitor:

Given:
Total charge
Induced charge
We substitute the values into the formula:

To solve for the dielectric constant K, simplify the equation:

Divide both sides by :

Rearrange to solve for :

Invert both sides to find K :

Therefore, the dielectric constant of the slab is

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