21.A Can the path of integration around which we apply the ampere law pass throu

Question

21.A Can the path of integration around which we apply the ampere law pass through a conductor?

B Discuss analogies and differences between magnetic fields and electric fields

C discuss differences between electric fields and magnetic fields inside materials

D. List the sources of the magnetic field discussed in class and provide examples

E. What is the difference between the biot savart law and the ampere law

F. Why is the flux of a magnetic field through a closed surface equal to zero?

G what is the difference between paragmagnetic, diamagnetic and ferromagnetic materials?

Explanation / Answer

a) Yes, but the results of the integration would not include all of the current in that conductor.

b) Electrostatic fields arise from motionless electric charges. Similarly, magnetostatic fields are caused by stationary magnets. Electromagnetic fields (waves) arise from accelerating electric charges, but can propagate though empty space independently of the charges that created them.

Electrical fields have there origine in electrical charges, and in changing magnetic fields.

Magnetic fields are generated around moving charges, or more generally speaking whenever there is a changing electrical field.

Magnetic and electrical fields relate strongly with one another, so you mostly find them in compound; even in electromagnetic waves, where they perpetuate each other

c) One difference that i really like is that electric field lines are terminating lines which means that they originate from +ve charge and end at -ve charge whereas the magnetic field lines are non-terminating i.e, they form a loop.

Another difference is that an electric charge experiences a force in a magnetic field only if it is moving. This is different from an electric field in that a charge experiences a force in an electric field even when it is stationary. Also, the direction of the force in a magnetic field is perpendicular to both the direction of the velocity and the magnetic field lines. In an electric field, the force vector is in the same direction as the electric field lines.

The Gauss law and Ampere law both are used, when the symmetry of distribution of charge in Gauss law and symmertry of distribution of current in Ampere law are spherical, Cylinderical, cubical etc, and also both use for closed surface,in Gauss law we draw a imagniry Gaussian surface to determine the charge distribution and in Ampere law we draw an (Amperian loop) to determine the current distribution. The one major difference is that Gauss law used in the applied electric field and Ampere law used in the applied magnetic field , means current flowing in symmetry distribution.

f) The sources for the electric field are charges. The flux of a electric field through aclosed surface is always zero if there is no net charge in the volume enclosed by the surface. ... The field lines radiate outward from the charge. The density of field lines reflects the magnitude of the electrical field at any point.

g) Most materials can be classified as diamagnetic, paramagnetic or ferromagnetic.Diamagnetic materials have a weak, negative susceptibility to magnetic fields.Diamagnetic materials are slightly repelled by a magnetic field and the materialdoes not retain the magnetic properties when the external field is removed

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