Download App

REPEATER 2024 — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsREPEATER 20243 Marks
Question
When $2 \times 10^{10}$ electrons are transferred from one conductor to another, a potential difference of 20 V appears between the conductors. Find the capacitance of the two conductors.
✓

Answer

Given: Number of electrons, $n=2 \times 10^{10}, V=20$ volt, $e=1.6 \times 10^{-19} C$
To find: $C=$ ?
Formula: $C=\frac{Q}{V}$
$\begin{array}{ll}\therefore & C=\frac{n e}{V}  \\ \therefore & C=\frac{2 \times 10^{10} \times 1.6 \times 10^{-19}}{20} \quad \quad (\because Q = ne) \\ \therefore & C=1.6 \times 10^{-10} F\end{array}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following in Brief" from REPEATER 2024→REPEATER 2024 — all question types→Physics STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Define absolute refractive index of a medium.
→
State the applications of Bernoulli's principle.
→
What is heat? Explain.
→
What is the electric potential at a point on the axis of a short electric dipole of moment $27 \ cm$ if the point is at $0.5 m$ from the centre of the dipole and is located in vacuum? $\left[\frac{1}{4 \pi \varepsilon_0}=9\right.$ $\left.\times 10^9 N \cdot m ^2 / C ^2\right]$
→
You have already studied in earlier classes that a short bar magnet suspended freely always aligns in North South direction. Now if you try to forcefully move and bring it in the direction along East West and leave it free, you will observe that the magnet starts turning about the axis of suspension. Do you know from where does the torque which is necessary for rotational motion come from? (as studied in rotational dynamics a torque is necessary for rotational motion).
→
Explain the construction of plane wavefront using Huygens' principle
→
Define surface tension. Obtain the relation between surface tension and surface energy.
→
What is a ‘soft’ magnetic material?###What is meant by a ‘soft’ iron?
→
Explain the Stefan-Boltzmann law.
→
In the above problem, what will be the magnetic field B inside the wire at a distance r from its axis, if the current density J is uniform across the cross section of the wire?
→