Electricity and Magnetism Answers

A long horizontal wire contains a current such that 9.0✕1018 electrons per second flow through any given point from left to right. Determine the (a)current and (b)magnitude of the field of the long wire at a point 10 mm parallel to it in the north.

Calculate the energy density in an electric field of 10⁶ V/m

It is known that the relative permeability of iron is 100. If the mean atomic dipole moment is equal to 2microB . Find the magnets of magnetization M ?

Determine the force of 1microcoulomb from a large metal plate to be grounded

A field of E=100 v/m is kept in copper. Determine the current density and the power loss per volume

Determine the energy required to reverse the direction of a magnetic dipole of 3×10^-4 A.m² in a magmetic field of 0,6 T

Explain why the Hall effect occurs when a wire with a square cross-section of side length w carrying charges moving with a drift velocity vd is placed in a uniform magnetic field B orientated perpendicular to the side of the wire. Give an expression for the magnitude of the Hall voltage produced in this case

Write down the Biot –Savart law which gives the magnetic field dB at a point P due to current 

element IdL. The vector from the current element to P is r .Sketch a diagram showing the 

relationship between the directions of dB, IdL and r.