Class 12th

$\frac{1}{f}=\frac{1}{v}-\frac{1}{u}$

$\Rightarrow \frac{1}{f}=\frac{1}{-100}-\frac{1}{-50}=\frac{1}{50}-\frac{1}{100}$

$\Rightarrow f=+100cm$

$C_{eq}=2C=\frac{2A{\epsilon }_0}{d}$

Flux through a surface $\mathrm{?}=\stackrel{?}{E}.\stackrel{?}{A}$  

$\mathrm{?}=\left(6\stackrel{?}{i}-4\stackrel{?}{j}+7\stackrel{?}{k}\right).200\stackrel{?}{i}$

$=1200unit$

_θR = $\frac{1}{60°}$  for human eye

$\Rightarrow \frac{{\theta }_R}{2}=\frac{6.28}{2*x}$

$\Rightarrow x=21.6km$

For no emission of electron

$\lambda >{\lambda }_0$

$?{\lambda }_0=\frac{hc}{w_0},so\lambda >\frac{hc}{w_0}$

Resistance of whole wire is

$R=r^{\text{'}}*l$

$20=1*l$

$l=20m$

Let length of the shorter section = a

$\frac{1}{R}=\frac{1}{a}+\frac{1}{\left(20-a\right)}$

$\frac{1}{1.8}=\frac{20-a+a}{a\left(20-a\right)}?20a-a^2=36$

$a=2and18$

$?a=2m$

Here are a few factors which are not responsible for affecting the motional EMF:

• Resistance
• Temperature
• Material
• Shape and Mass
• Electron Flow

This chapter covers the concepts of potential, capacitors, and potential energy. It is considered as one of the easy chapter of the class 12 Physics.

It is the farad (F). The name came from Michael Faraday. SI Unit of Capacitance means the ability of a system to store an electric charge. One farad is the capacitance of a device that needs one coulomb of charge to provide one volt potential difference across it. Mathematically, it is represented by - 1 Farad = 1 Coulomb/Volt. 

Motional EMF is a condition which arises due to the movement of conductor in a magnetic field. On the other hand, induced EMF is a cause of change in the magnetic fiedl over a certain timespan. Induced EMF arises when there is a change in the magnetic flux.