Electric Circuits Answers

Explain the terms polarisation surface charges and molecular polarisability for a
dielectric material.

Two concentric thin metallic spheres having radii 30 cm and 20 cm carry 10 µC and
5 µC, charges respectively. Calculate the electric potential at a distance of 25 cm
from the centre of the spheres.

Two concentric thin metallic spheres having radii 30 cm and 20 cm carry 10 µC and
5 µC, charges respectively. Calculate the electric potential at a distance of 25 cm
from the centre of the spheres.

A positive 20µC charge is placed at the centre of a circle of radius 20 cm. If we
move a positive 2µC charge once along the circumference of the circle, will any
work be done in the process? Justify your answer.

The magnitude of work done in taking a unit positive charge in electric field E from
point A to point B is given by:
W= ∫−E.d r
Show that the value of the line integral of the electric field (right hand side of the
above equation) does not depend on the path taken to move the unit positive charge
from point A to B.

Show that, if there are any unbalanced, static charges on an isolated conductor, they
must reside on its surface.

Calculate the ratio of the electrostatic force and the gravitational force exerted by
two protons on each other.

The line density of charge in a wire is 0.2 Cm−1. If this wire is symmetrically
enclosed, along its length, by a cylindrical surface of radius 1 m and length 1.5 m,
calculate i) the electric flux through the cylindrical surface, and ii) the electric field
at the curved surface of the cylinder.

A ball with charge -50e is placed at the center of a hollow spherical shell has a net charge of -50e. What is the charge on the shell's outer space? ((please solve with details))

Hi can you help me in our research project. because the problem is when I attach the DC motor and a battery that 4 V with a usb phone charger, the phone is charging but it doesn't storing energy that came from the dc motor.