NEET · Physics · STD 12 - 2. Electric potential and capacitance
Two charged spherical conductors of radius \(R_{1}\) and \(\mathrm{R}_{2}\) are connected by a wire. Then the ratio of surface charge densities of the spheres \(\left(\sigma_{1} / \sigma_{2}\right)\) is :
- A \(\frac{\mathrm{R}_{1}}{\mathrm{R}_{2}}\)
- B \(\frac{R_{2}}{R_{1}}\)
- C \(\sqrt{\left(\frac{\mathrm{R}_{1}}{\mathrm{R}_{2}}\right)}\)
- D \(\frac{\mathrm{R}_{1}^{2}}{\mathrm{R}_{2}^{2}}\)
Answer & Solution
Correct Answer
(B) \(\frac{R_{2}}{R_{1}}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{Q}_{1}=\frac{\sum \mathrm{Q}}{\mathrm{R}_{1}+\mathrm{R}_{2}} \times \mathrm{R}_{1}\) \(\mathrm{Q}_{2}=\frac{\sum Q}{\mathrm{R}_{1}+\mathrm{R}_{2}} \times \mathrm{R}_{2}\)
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
- Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity \(2 K\) while that in the middle has thermal conductivity \(K\). The left end of the combination is maintained at temperature \(3 T\) and the right end at \(T\). The rods are thermally insulated from outside. In steady state, temperature at the left junction is \(T_1\) and that at the right junction is \(T_2\). The ratio \(T_1 / T_2\) is
NEET 2025 Hard - Taking into account of the slgnificant figures, what is the value of \(9.99\, m -0.0099\, m ?\)NEET 2020 Easy
- Two rods \(A\) and \(B\) of different materials are welded together as shown in figure.Their thermal conductivities are \(K_1\) and \(K_2\) The thermal conductivity of the composite rod will be
NEET 2017 Medium - A rectangular wire loop of sides 8 cm and 3 cm with a small cut, is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the plane of the loop. The emf developed across the cut, if the velocity of the loop is \(2 cm s ^{-1}\), in a direction normal to the shorter side of the loop, will be :NEET 2026 Easy
- Figure shows a circuit that contains three identical resistors with resistance \(R = 9.0 \,\,\Omega\) each, two identical inductors with inductance \(L = 2.0\, mH\) each, and an ideal battery with \(emf\,\, = 18 \,\,V.\) The current \(i\) through the battery just after the switch closed is
NEET 2017 Medium - A thin wire of length ' \(L\) ' and linear mass density ' \(m\) ' is bent into a circular ring (in \(x-y\) plane) with centre ' \(C^{\prime}\) as shown in figure. The moment of inertia of the ring about an axis \(y y^{\prime}\) will be :
NEET 2026 Hard
More PYQs from NEET
- Which stage of meiosis can last for months or years in the oocytes of some verterbrates?NEET 2022 Medium
- Embryological support for evolution was proposed byNEET 2020 Easy
- If an electron in a hydrogen atom jumps from the \(3^{rd}\) orbit to the \(2^{nd}\) orbit, it emits a photon of wavelength \(\lambda\). when it jumps from the \(4^{th}\) orbit to the \(3^{rd}\) orbit, the corresponding wavelength of the photon will beNEET 2016 Medium
- Transition state structure of the substrate formed during an enzymatic reaction isNEET 2013 Medium
- Given below are two statements : Statement I: Both \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right) 6\right]^{3+}\) and \(\left[\mathrm{CoF}_6\right]^3\) complexes are octahedral but differ in their magnetic behaviour. Statement II: \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)\right]^{3+}\) is diamagnetic whereas \(\left[\mathrm{CoF} \mathrm{F}_6\right]^{3-}\) is paramagnetic. In the light of the above statements, choose the correct answer from the options given below:NEET 2024 Medium
- A double convex lens has focal length \(25\; \mathrm{cm}\). The radius of curvature of one of the surfaces is double of the other. Find the radii If the refractive index of the material of the lens is \(1.5 \)NEET 2019 Medium