Electric Charges and field-Quick Revision

According to the principle of Quantization of charge, which of the following equations represents the quantization of charge?

The correct expression for the electric field intensity is

• $\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ q_0\overrightarrow{\ F\ }$

• $\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ \frac{\overrightarrow{\ F\ }^{2\ }}{q_{0\ }}$

• $\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ \frac{\overrightarrow{\ F\ }}{q_0^2}$

• $\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ \frac{\overrightarrow{\ F\ }}{q_0}$

The correct expression for dipole moment is _________

• $p=2aq$

• $p=q^2\left(2a\right)$

• $p=\frac{q}{2a}$

• $p=4a^2q$

What is the electric field for a dipole at an axial point at distance 'r' from the centre of the dipole?

What is the electric field for a dipole at an equatorial point at distance 'r' from the centre of the dipole?

For a short dipole the relation between electric field a point on the axial point and on the equatorial point is

• 
  

  $\overrightarrow{E}_{equatorial}=\overrightarrow{E}_{axial}$
  

• $2\overrightarrow{E}_{equatorial}=\overrightarrow{E}_{axial}$

• $\overrightarrow{E}_{equatorial}=-\overrightarrow{E}_{axial}$

• $\overrightarrow{E}_{equatorial}=-2\overrightarrow{E}_{axial}$

What is the expression for Torque on an electric dipole in an uniform electric field?

What is the total electric flux through a closed surface S according to Gauss’s law?

What is the correct expression for electric flux through a surface?