An isolated conducting spherical shell  has  net charge C and a particle of charge   C at the center . What is the charge on the outer surface of the sell in ( C)?

An infinitely long hollow cylindrical shell of inner radius 2 cm and outer 6 cm carries a uniform charge density 6.5 nC/m³. Calculate the electric field (in units of N/C) at a distance 9 cm from the axis of the cylinder.

A charged sphere of radius creates an electric field of magnitude at a distance    from the center of the sphere. What is the total electric field at a distance r=2d from the sphere center. 

A nonuniform electric field given by pierces the Gaussian cube shown in the figure. (E is in newtons per coulomb and x is in meters.) What is the electric flux (in N.m²/C) through the top face ?                                                                                                                    

An electric dipole consists of charges +e and -e separated by 2.3 nm aligned parallel to an electric field of strength 5×10⁶ N/C. The work done by the electric field  (in J) when we turn the dipole  by 180 degrees from the field direction  equals: e= 1.6×10^-19 C

An electron enters the space between the parallel capacitor shown in the figure with velocity  from the left edge at the point (0,0).  The electric field between the plates is N/C. The position vector of the electron after time t is given by then the time (in s) required to reach this position equals: