<<JUST ANSWER THE QUESTIONS IN THE BOTTOM FOR THE LAB PROVIDED!!! INTRODUCTION:
ID: 1447514 • Letter: #
Question
<<JUST ANSWER THE QUESTIONS IN THE BOTTOM FOR THE LAB PROVIDED!!!
INTRODUCTION:
The main idea of this laboratory experiment is to provide Faraday’s Law and Lenz’s Law. The fact that an electric and hence an EMF can be induced (created ) by a charging magnetic field.
APPARATUS NEEDED:
We need Magnets, Faraday’s law apparatus of two coils, galvanometer, compass, battery, key switch, wires, and a straight piece of steel.
THEORY:
The EMF induced in a coil of N turns with area A by a changing magnetic field B is given by Faraday’s law of induction.
= Nd(BA)/dt
Where B is the component of the magnetic field perpendicular to the coil.
The coil may be wound in two ways which are clockwise and counterclockwise. In the experiment the direction of the coil is wound is very important.
PROCEDURE:
The glass bulb was placed within the Helmholtz coil such that the direction the electrons were accelerated was parallel the plane of the diameters of the coil. The filament voltage was increased until electrons began to boil off and become visible. Once the electrons were visible, they were accelerated by modifying the accelerating voltage until they began to form a loop within the bulb. The angling of the bulb was modified until the path was circular. The voltage through the coils was set to 200V.The accelerating voltage was changed until the electrons traveled around in a circle. This specific current associated with the accelerating voltage was Recoded, data table reproduced below. The voltage was varied until the path passed through each peg within the bulb. Each time, the current was noted. Last two steps were repeated with various other voltages 200V, 250V, 300V, 350V.
Part III
Bar Magnet
Deflection
Speed of insertion
Magnitude
Direction
Moving Magnet
Into coil
Out of coil
Into coil
Out of coil
Slow
North
.5
5
+
-
Slow
South
.4
4
-
+
Fast
North
+50
50
+
-
Fast
South
-50
5
-
+
Table 8.2a
Bar Magnet
Deflection
Speed of insertion
Magnitude
Direction
Moving Magnet
Into coil
Out of coil
Into coil
Out of coil
Slow
North
2
-
Slow
South
-2
+
Fast
North
10
-
Fast
South
-10
+
Table 8.2b
Bar Magnet
Deflection
Speed of insertion
Magnitude
Direction
Moving Magnet
Into coil
Out of coil
Into coil
Out of coil
Slow
North
3
-
Slow
South
-3
+
Fast
North
8
-
Fast
South
-6
+
Large coil connected to battery
Magnitude Deflection
Direction Deflection
Without Bar
Closing
Nothing
Small tiny deflection to -
Holding
0
Opening
0
With Bar
Closing
Yes
Small deflection to -
Holding
No
0
Opening
Yes
+
Small coil connected to battery
Magnitude Deflection
Direction Deflection
Without Bar
Closing
Large
Holding
N/A
Opening
0
-
With Bar
Closing
Large
Small deflection to -
Holding
N/A
0
Opening
Large
+
CONCLUSION:
We can clearly conclude that the important steps in this experiment are the error analysis. The uncertainty in magnetic field produced was the only uncertainty considered. The uncertainty in magnetic field was dependent upon only one variable, I and technically the radius of the coil However, this was considered to be machined to perfection and the uncertainty in the voltage produced was quite small.
QUESTION ANSWER:
In part II did the direction and /or magnitude of thee deflection change when the magnet was pulled out versus pushed in? What about the speed of insertion?
What is the earth’s magnetic pole in the northern hemisphere? (i.e is it a north magnetic pole or a south magnetic pole?). Explain your reasoning.
Is there any deflection if the key is left on and thee current is flowing at a steady rate? why? Explain.
In part IV and part V, what changes and how when the steel bar is inserted, also when the larger coil and the smaller are switched? Explain.
<<JUST ANSWER THE QUESTIONS IN THE BOTTOM FOR THE LAB PROVIDED!!!
Bar Magnet
Deflection
Speed of insertion
Magnitude
Direction
Moving Magnet
Into coil
Out of coil
Into coil
Out of coil
Slow
North
.5
5
+
-
Slow
South
.4
4
-
+
Fast
North
+50
50
+
-
Fast
South
-50
5
-
+
Explanation / Answer
1.)magnitude of delefection remains same as magnet was pulled out versus pushed in.
as E = -N * change in flux
and change in flux remains same. so magnitude of induce emf remains same.
but if we change the speed of insertion then the magnitude of deflection will change.
2.)it a north magnetic pole
The North Magnetic Pole is the point on the surface of Earth's Northern Hemisphereat which the planet's magnetic field points vertically downwards (in other words, if amagnetic compass needle is allowed to rotate about a horizontal axis, it will point straight down)
3.)No there would be no deflection occur if the current is in steadt rate
as there is no change in current and hence no change in magneic filed so no induce emf so no deflection
4.) when steel bar is inserted then the induce emf will change because the permebility of the coil will change so induce emf will also change.
and when we switch the larger coil and smaller coil then also induce emf will change because area will change hence flux will change so induce emf will change
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.