JEE Mains · Physics · STD 12 - 2. Electric potential and capacitance
Two parallel plate capacitors \(C_1\) and \(C_2\) each having capacitance of \(10 \mu F\) are individually charged by a \(100\,V\) \(D.C.\) source. Capacitor \(C _1\) is kept connected to the source and a dielectric slab is inserted between it plates. Capacitor \(C _2\) is disconnected from the source and then a dielectric slab is inserted in it. Afterwards the capacitor \(C_1\) is also disconnected from the source and the two capacitors are finally connected in parallel combination. The common potential of the combination will be \(.........V.\) (Assuming Dielectric constant \(=10\) )
- A \(40\)
- B \(50\)
- C \(55\)
- D \(65\)
Answer & Solution
Correct Answer
(C) \(55\)
Step-by-step Solution
Detailed explanation
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- In the Young's double slit experiment, the distance between the slits varies in time as \({d}({t})={d}_{0}+{a}_{0}\, sin\omega \,t\) ; where \({d}_{0}, \omega\) and \(a_{0}\) are constants. The difference between the largest fringe width and the smallest fringe width obtained over time is given as :JEE Mains 2021 Hard
- Two long parallel wires \(X\) and \(Y\), separated by a distance of 6 cm , carry currents of 5A and 4A, respectively, in opposite directions as shown in the figure. Magnitude of the resultant magnetic field at point P at a distance of 4 cm from wire Y is \(x \times 10^{-5} \mathrm{~T}\). The value of \(x\) is__________ . Take permeability of free space as \(\mu_0=4 \pi \times 10^{-7} \mathrm{SI}\) units.
JEE Mains 2025 Easy - From a sphere of mass \(M\) and radius \(R\), a smaller sphere of radius \(\frac{R}{2}\) is carved out such that the cavity made in the original sphere is between its centre and the periphery (See figure) . For the configuration in the figure where the distance between the centre of the original sphere and the removed sphere is \(3R\), the gravitational force between the two sphere is
JEE Mains 2014 Hard - The refractive index of a transparent liquid filled in an equilateral hollow prism is \(\sqrt{2}\). The angle of minimum deviation for the liquid will beJEE Mains 2023 Medium
- Match List \(- I\) (Fundamental Experiment) with List \(- II\) (its conclusion) and select the correct option from the choices given below the list \(\begin{array}{|||} \hline List\,\,-1 & List\,\,-II\,\, \\ \hline a\,\,Franck-Hertz\,\,Experiment & i\,\,Particle\,\,nature\,\,of\,\,light \\ \hline b\,\,Photo\,\,-electric\,\,Experiment & ii\,\,Discrete\,\,energy \,\, levels\,\,of\,\,atom \\ \hline c\,\,Davison-Germer\,\,Experiment & iii\,\,Wave\,\,nature\,\,of\,\,electron \\ \hline & iv\,\,Structure\,\,of\,\,atom \\ \hline \end{array}\)JEE Mains 2015 Medium
- In an experment ot verify Newton's law of cooling, a graph is plotted between, the temperature difference \((\Delta T )\) of the water and surroundings and time as shown in figure. The initial temperature of water is taken as \(80^{\circ} \,C\). The value of \(t _{2}\) as mentioned in the graph will be...........
JEE Mains 2022 Hard
More PYQs from JEE Mains
- Let \(A=\{ x \in R :[ x +3]+[ x +4] \leq 3\}\), \(B=\left\{x \in R : 3^x\left(\sum_{x=1}^{\infty} \frac{3}{10^x}\right)^{x-3} < 3^{-3 x}\right\}\), where \([t]\)denotes greatest integer function. Then,JEE Mains 2023 Hard
- If \(x\, = \,{\sin ^{ - 1}}(\sin \,10)\) and \(y = \,{\cos ^{ - 1}}\,(\cos \,10)\) , then \(y -x\) is equal toJEE Mains 2019 Hard
- In the given circuit, rms value of current \(\left( I _{ rms }\right)\) through the resistor \(R\) is :\(..........\,A\)
JEE Mains 2023 Medium - Let the moment of inertia of a hollow cylinder of length \(30\, cm\) (inner radius \(10\, cm\) and outer radius \(20\, cm\)), about its axis be \(I\). The radius of a thin cylinder of the same mass such that its moment of inertia about its axis is also \(I\), is ......... \(cm\).JEE Mains 2019 Hard
- If \(\mathrm{A}, \mathrm{B}\), and \(\left(\operatorname{adj}\left(\mathrm{A}^{-1}\right)+\operatorname{adj}\left(\mathrm{B}^{-1}\right)\right)\) are non-singular matrices of same order, then the inverse of \(\mathrm{A}\left(\operatorname{adj}\left(\mathrm{A}^{-1}\right)+\operatorname{adj}\left(\mathrm{B}^{-1}\right)\right)^{-1} \mathrm{~B}\), is equal toJEE Mains 2025 Medium
- A galvanometer of resistance \(G\) is converted into a voltmeter of range \(0-1\, V\) by connecting a resistance \(R _{1}\) in series with it. The additional resistance that should be connected in series with \(R _{1}\) to increase the range of the voltmeter to \(0-2\, V\) will beJEE Mains 2020 Hard