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What is diamagnetism ?

What is diamagnetism? (Shan asked)

Diamagnetism is the property of an object which causes it to create a magnetic field in opposition to an externally applied magnetic field, thus causing a repulsive effect. (Wikipedia)

Please refer to the following links for further details.

http://hyperphysics.phy-astr.gsu.edu/hbase/solids/magpr.html

http://www.exploratorium.edu/snacks/diamagnetism_www/index.html

http://www.sjsu.edu/faculty/watkins/diamag.htm

http://en.wikipedia.org/wiki/Diamagnetism

What do you mean by impedance of an antenna?

What do you mean by impedance of an antenna? (Asked Sims)

Answer: In general, impedance is defined as the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance.

An antenna’s impedance relates the voltage to the current at the input to the antenna.  The knowledge about the impedance is crucial for obtaining maximum power transmission/reception at a given frequency.

For more details please refer to

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