Question

The plates of parallel plate capacitor are charged upto100 V. A1.6 mm. The dielectric constant of the plate is

• A. 5
• B. 1.25
• C. 4
• D. 2.5

Answer 1

Answer: (A)

5

Answer 2

In air the potential difference between the plates

..... (i)

In the presence of partially filled medium potential difference between the plates

$V _ { m } = \frac { \sigma } { \varepsilon _ { 0 } } \left( d - t + \frac { t } { K } \right)$ ..... (ii)

Potential difference between the plates with dielectric medium and increased distance is

..... (iii)

According to question which gives

$K = \frac { t } { t - d ^ { \prime } }$

Hence $K = \frac { 2 } { 2 - 1.6 } = 5$