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Inducing current in a coiled conductor
Aim: to study the effect on a generated electric current when;
a) the distance between the coil and the magnet are varied
b) the strength of the magnet is varied
c) relative motion between the coil and the magnet is varied
Apparatus:
· Galvanometer
· Two coils having different numbers of turns of wire
· Two bar magnets, of different strengths
· An iron core that fits into the coils
· Connecting wires
Prediction:
When a magnet is passed through a coil of wire, a current is induced in the coil. The strength and the speed of the magnet will determine the size of the current as it passes through the coil. The strength or magnitude of the induced current is governed by Faraday’s Second Law: the magnitude of an induced E. ... This means that the stronger the magnet and the greater the speed of the magnet as it travels through the coil, the larger the current produced from the coil. As a current passes through a coil, a magnetic field should be generated. Conversely, as a magnet travels through a coil, it generates a current. Lenz’s law says that the current produced by the magnet flows in the opposite direction, producing a magnetic field that opposes the magnetic field of the magnet.
Theory:
Control: something the independent variable can be compared with
The control throughout the study of the effects of the different coil sizes, the strength of the magnet and relative motion in this experiment is the electrical current. ...
Dependent variable: what you want to measure
The dependent variable throughout this experiment is the electric current, (galvanometer)
Constant variable: keep the same
When studying the effect of different coil sizes the constant variables are the magnet strength and the distance and speed of the magnet. ... By placing a permanent magnet near a wire coil and then turned on the current to create an electromagnet, then the coil would either be attractive or repulsive to the permanent magnet. ... Michael Faraday furthered this idea by discovering that passing a magnet through a loop of wire created a current. ...
Solenoid
A solenoid is a coil of insulated wire that can carry an electric current. ... When a current flows through the solenoid, the iron core becomes a magnet. ... According to faraday’s law, this changing magnetic field induces a current in the conductor. The induced current can flow in either of only two possible ways, either clockwise or anti-clockwise when viewed from above. If the current were to flow clockwise, the top of the coil would become an S pole, according to the solenoid rules.
Approximate Word count = 2114
Approximate Pages = 8.5
(250 words per page double spaced)
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