Concentration of electric charges (negative or positive) due to the imbalance of charges in an object

Derive an expression for electric field intensity at a point due to point charge.

Is haemoglobin negatively or positively charged sol?

A positive point charge +Q is fixed in space .A negative point charge -q of mass m revolves around a fixed charge in elliptical orbits .The fixed charge +Q is at one focus of the ellipse.The only force acting on negative charge is the electrostatic force due to positive charge is the electrostatic force due to positive charge.Then which of the following statement is true

A thin metallic spherical shell contains a charge Q on it. A point charge q is placed at the center of the shell and another charge q_1 is placed outside it as shown in the figure. All the three charges are positive. Find the force on the charge a. at centre due to all charges. b. at center due to shell.

There are two types of electric charges positive charges and negative charges. The property which differentiates the two types of charges is

(a) Define electric flux. Write its S.I. units. (b) Using Gauss's law, prove that the electric field at a point due to a uniformly charged infinite plane sheet is independent of the distance from it. (c ) How is the field directed if (i) the sheet is positively charged, (ii) negatively charged ?

In case of electronic current the charge flows from negatively charged body to the Positively charged body. The body which is at higher potential is :

An infinite number of charges each q are placed in the x-axis at distances of 1, 2, 4, 8, ………meter from the origin. If the charges are alternately positive and negative find the intensity of electric field at origin.

Two concentric metallic spherical shells are given positive charges . Then

Assertion : In a uniform electric field electrons move in the opposite direction of electric field. Reason : This is because of the negative charge of an electron.