NEET 2016 Phase 2 | Capacitor Question 19 | Physics

A parallel-plate capacitor of area a, plate separation d and capacitance C is filled with four dielectric materials having dielectric constants k₁, k₂, k₃ and k₄ as shown in the figure. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by
NEET 2016 Phase 2 Physics - Capacitor Question 35 English

NEET 2016 Phase 2 Physics - Capacitor Question 35 English

k = k₁ + k₂ + k₃ + 3k₄

k = $${2 \over 3}$$ (k₁ + k₂ + k₃) + 2k₄

$${2 \over k}$$ = $${3 \over {{k_1} + {k_2} + {k_3}}} + {1 \over {{k_4}}}$$

$${1 \over k}$$ = $${1 \over {{k_1}}} + {1 \over {{k_2}}} + {1 \over {{k_3}}} + {3 \over {2{k_4}}}$$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

A capacitor of 2 $$\mu $$F is charged as shown in the diagram. When the switch S is turned to position 2, the percentage of its stored energy dissipated is
NEET 2016 Phase 1 Physics - Capacitor Question 34 English

NEET 2016 Phase 1 Physics - Capacitor Question 34 English

75%

80%

20%

AIPMT 2015

MCQ (Single Correct Answer)

-1

A parallel plate air capacitor has capacity C, distance of separation between plates is d and potential difference $$V$$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is

$${{C{V^2}} \over d}$$

$${{{C^2}{V^2}} \over {2{d^2}}}$$

$${{{C^2}{V^2}} \over {2d}}$$

$${{C{V^2}} \over {2d}}$$

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dieletric constant K, which can just fill the air gap of the capacitor, is now inserted in it . Which of the following is incorrect ?

The change in energy stored is $${1 \over 2}C{V^2}\left( {{1 \over K} - 1} \right)$$

The charge on the capacitor is not conserved.

The potential difference between the plates decreases K times.

The energy stored in the capaciotor decreases K times.

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