Electricity and Magnetism Answers

A capacitor has been charge by a dc source What is th e magnitude conductance and displacement current when it is fully charged?

show that the function u(x,t) = e^-μt sin x is a solution of the one-dimentional heat equation

A steel ring, having a mean circumference of 750 mm and a cross-sectional area
of 500 mm
2
, is wound with a magnetizing coil of 120 turns. Using the following
data, calculate the current required to set up a magnetic flux of 630 μWb in the
ring.
Flux density (T) 0.9 1.1 1.2 1.3
Magnetic field strength (A/m) 260 450 600 820

how far apart must the point changes of 75nC be to have force of 1.00 N between them

a 12 μc charge is place at the origin. A second -8.0 μc charge is placed 1.04cm to the right of the first. A third 6.0 μc charge is placed 1.0m above the first charge. What is the force on second charge due the other two?

Find the magnetizing field H and the magnetic flux density point of B at (a) a 105 mm from a long straight wire carrying a current of 15 A and (b) the center a 2000-turn solenoid which is 0.24m long and bears a current of 1.6A

Given a system of N points, use the method of multiple expansion to show that the potential of this configuration is given by Φ(

A point charge q is brought to a position a distant d away from an infinite plane conductor held at zero potential. Use the method of images, to find:
i. The surface charge density induced on the plane (6 marks)
ii. The force between the plane and the charge by using Coulomb’s law for the force between the charge and its image (2 marks)
iii. The total force acting on the plane by integrating

Two charges A and B of 5uC each separated by a distance of 6cm. C is midpoint of the line joining A and B. A charge Q of -5uC is shot perpendicular to the line joining A and B through C with kinetic energy of 0.06J. The charge Q comes to rest at a point D. The distance CD is

two identical metal sphere carry charges +q and -2q .when the spheres are separated by a large distance r.the force btw them is F .now the sphere are allowed to touch and then moved back to the same separation .find new F