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# A Capacitor Stores 50 µC Charge When Connected Across a Battery. When the Gap Between the Plates is Filled with a Dielectric, a Charge of 100 µC Flows Through the Battery. - Physics

ConceptDielectrics and Polarisation

#### Question

A capacitor stores 50 µC charge when connected across a battery. When the gap between the plates is filled with a dielectric, a charge of 100 µC flows through the battery. Find the dielectric constant of the material inserted.

#### Solution

Given:

Initial charge on the capacitor = 50 µC

Now, let the dielectric constant of the material inserted be k.
As 100 µC of extra charge flows through the battery,  the net charge on the capacitor becomes

50 + 100 = 150 µC

Now ,

C_1 = q_1/V = (∈_0A)/d               ............(i)

C_2 = q_2/V = (∈_0Ak)/d               ............(ii)

On dividing (i) by (ii), we get

C_1/C_2 = q_1/q_2 = 1/k

⇒ 50/150 = 1/k

⇒ k = 3

Thus, the dielectric constant of the given material is 3.

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Solution A Capacitor Stores 50 µC Charge When Connected Across a Battery. When the Gap Between the Plates is Filled with a Dielectric, a Charge of 100 µC Flows Through the Battery. Concept: Dielectrics and Polarisation.
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