What is the first observation of the appearance of a magnetic field along with an electric current? a) The Earth is a large magnet. b) The magneti...
What is the first observation of the appearance of a magnetic field along with an electric current?
a) The Earth is a large magnet.
b) The magnetic field is the region of space where a small test body is subject to a magnetic force.
c) The magnetic field is a force field that acts even if there is no contact between the bodies.
d) The displacement of a magnetic needle when placed near an electric current can be explained by the formation of a magnetic field around the conductor carrying the electric current.
a) The Earth is a large magnet.
b) The magnetic field is the region of space where a small test body is subject to a magnetic force.
c) The magnetic field is a force field that acts even if there is no contact between the bodies.
d) The displacement of a magnetic needle when placed near an electric current can be explained by the formation of a magnetic field around the conductor carrying the electric current.
a) The Earth is a large magnet.
b) The magnetic field is the region of space where a small test body is subject to a magnetic force.
c) The magnetic field is a force field that acts even if there is no contact between the bodies.
d) The displacement of a magnetic needle when placed near an electric current can be explained by the formation of a magnetic field around the conductor carrying the electric current.
a) The Earth is a large magnet.
b) The magnetic field is the region of space where a small test body is subject to a magnetic force.
c) The magnetic field is a force field that acts even if there is no contact between the bodies.
d) The displacement of a magnetic needle when placed near an electric current can be explained by the formation of a magnetic field around the conductor carrying the electric current.
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Ed 
The correct answer is d) The displacement of a magnetic needle when placed near an electric current can be explained by the formation of a magnetic field around the conductor carrying the electric current. This observation was made by Hans Christian Oersted in 1820.
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