Electricity and Magnetism Answers

Explain the potential due to point charge.

Write lenz first law?

A copper wire has a diameter of 4.00mm. If the drift speed of the electrons in the wire is 0.0002 m/s, calculate the current flowing in the wire. Assume each copper atom contributes two free electrons to the current. The density of copper is 8.93 g/cm^3 and it's molar mass is 63.5 g/mol.

A metal sphere has a charge of +8.0 µC.
What is the net charge after 6.0×10
13
electrons have been placed on it?

(a) State the laws of electrostatics in integral form.
(b) A uniformly charged long cylinder of radius a and length L has
total charge q inside its volume.
What is the direction of the electric field at points outside the cylinder?
Find the electric field inside and outside the cylinder.

State the laws of electrostatics in integral form.
(b) A uniformly charged long cylinder of radius a and length L has
total charge q inside its volume.
What is the direction of the electric field at points outside the cylinder?
Find the electric field inside and outside the cylinder.

I have 1.2-1250 umol of Iron (Fe) in seawater, how would I work out the strength of the electromagnet needed to extract the iron in the seawater? Is there a relevant set of formulas needed?

How can we explain self inductance?

Write lorenz force expression.