Understanding the Electrostatic Model

Q.

What is an electrostatic charge?

Q. The linear charge density of a thin rod of length $L$ is given by $\lambda =\left({\lambda }_{0}x\right)\text{Coulomb/m},[0\le x<\frac{L}{2}]$ and $\lambda =\left({\lambda }_0{x}^2\right)\text{Coulomb/m},[\frac{L}{2}\le x\le L]$. Find the total charge on rod. $(x$ is measure from one end of the rod$)$.

1. $\frac{{\lambda }_0{L}^3}{8}(1+5L)$
2. ${\lambda }_0{L}^2(1+7L)$
3. $\frac{{\lambda }_0{L}^2}{24}(3+7L)$
4. $\frac{{\lambda }_0{L}^2}{4}(1+7L)$

Q.

What is the interest of a gauge theory in physics?

Q. What is the smallest electric force between two charges placed at a distance of $1\text{m}$ ?

1. $2.75\times {10}^{-28}\text{N}$
2. $2.30\times {10}^{-28}\text{N}$
3. $2.5\times {10}^{-25}\text{N}$
4. $1.5\times {10}^{-24}\text{N}$

Q.

Why does gravity have no quantum properties?

Q.

Two charged conducting bodies $A$ and $B$ having potentials $V_1$and $V_2(>V_1)$respectively are kept far away from each other. Now they are being joined together by a conducting wire. Are the electrons are transferred from $A$ to $B$or $B$ to$A$? Explain your answer.