Faraday's InventionsChange the paraghaph to the PAST PERFECT TENSE.
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Faraday's greatest work __________ _________ (be) with electricity.
In 1821, soon after the Danish chemist, Hans Christian Orsted,
__________ ___________ (discover) the phenomenon of
magnetism, Humphrey Davy and William Hyde Wollaston __________
__________ (try) but ___________ __________ (fail) to design
an electric motor. Faraday, __________ __________ (discuss) the
problem with the two men, __________ __________ (go) on to build
two devices to produce what he __________ __________ (call)
electromagnetic rotation which is a continuous circular motion from the
circular magnetic force around a wire.
Ten years later, in 1831, he __________ __________ (begin) his
great series of experiments in which he _________ __________
(discover) electromagnetic induction. He ___________ _________
(find) that if he moved a magnet through a loop of wire, an electric
current flowed in the wire. The current also flowed if the loop was
moved over a stationary magnet. This ___________ __________(be)
the first transformer (inductor), although Faraday ___________
__________ (use) it only to demonstrate the principle of
electromagnetic induction and did not realize what it would eventually be used for.
His experiments __________ __________ (establish) that a changing
magnetic field __________ __________ (produce) an electric field.
This relation __________ __________ (be) mathematically modeled
by faraday's law, which afterwards __________ __________
(become) one of the four Maxwell equations. These in turn
__________ ___________ (evolve) into the generalization known as
field theory. Faraday then __________ __________ (use) this principle to
construct the first dynamo (in the form of a copper disk rotated
between the poles of a permanent magnet), the predecessor of
modern dynamos and generators.
In 1832, Michael Faraday ___________ __________ (report) that the
quantity of elements ___________ _____________ (be) __________
(separate) by passing an electrical current through a molten or
dissolved salt and ___________ ___________ (be) proportional to
the quantity of current passed through the circuit. This ___________
___________ (become) the basis of the first law of electro sis. He
___________also ____________ (popularize) terminology such as
anode, cathode, electrode, and ion.
In 1845 he also __________ ____________ (discover) the
phenomenon that he named Diamagnetism - a very weak form of
magnetism that __________ only ___________ (be) __________
(exhibit) in the presence of an external magnetic field. This
phenomenon can be used for levitation.
In his work on static electricity, Faraday __________ __________
(demonstrate) that the charge only __________ __________ (reside)
on the exterior of a charged conductor, and exterior charge had no
influence on anything enclosed within a conductor. This is because the
exterior charges __________ __________ (be) _____________
(redistribute) in such a way that the interior fields due to them __________ __________
(be) cancel. This shielding effect is used in what is now known as a Faraday cage.
