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. The dielectric constant of the material is-

• A. 2.5
• B. 2
• C. 4
• D. 3

Answer 1

Answer: (D)

3

Answer 2

Q₁ = C₁V

Q ₂ =C₂V

$\frac { 50 } { 150 }$ = $\frac { \varepsilon _ { 0 } } { \mathrm {~K} \varepsilon _ { 0 } }$

K = 3