1
NEET 2017
+4
-1
A capacitor is charged by a battery. The battery is removed and another identical unchanged capacitor is connected in parallel. The total electrostatic energy of resulting system
A
decreases by a factor of 2
B
remains the same
C
increases by a factor of 2
D
increases by a factor of 4
2
NEET 2016 Phase 2
+4
-1
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
A
k = k1 + k2 + k3 + 3k4
B
k = $${2 \over 3}$$ (k1 + k2 + k3) + 2k4
C
$${2 \over k}$$ = $${3 \over {{k_1} + {k_2} + {k_3}}} + {1 \over {{k_4}}}$$
D
$${1 \over k}$$ = $${1 \over {{k_1}}} + {1 \over {{k_2}}} + {1 \over {{k_3}}} + {3 \over {2{k_4}}}$$
3
NEET 2016 Phase 1
+4
-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
A
75%
B
80%
C
0%
D
20%
4
AIPMT 2015
+4
-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
A
$${{C{V^2}} \over d}$$
B
$${{{C^2}{V^2}} \over {2{d^2}}}$$
C
$${{{C^2}{V^2}} \over {2d}}$$
D
$${{C{V^2}} \over {2d}}$$
EXAM MAP
Medical
NEET