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Unformatted text preview: Lab 7 Lab Report (100 points) Name: m PHYS 1214 2114) Section: “35
Day and Time: Wig/z! %1 my}? Station Checkin: Table l (10 pts) Diameter of wire Length of wire Distance mirror to screen Distance mirror to Wire Centertocenter separation of wires* Full deﬂection of wires *calculated in #1 Table 2: Force vs. Current S I uared Data (28 Force
F = MX10'6 (N) Lab 7 The Current Balance Lab 7 The Current Balance 1. At the balance point, ¢mmr = i, and the angle between the two reﬂected beams is 1 x
¢light = #2. Since ¢light = 2¢m,,,‘0, , we can easily obtain the insider‘separ tiOn of the rods.
x2
Find the separation,y1, of the conducting rods (remember that the separation is centert0
center). (4 pts) Figure 13 2. Theory predicts that a long, straight, currentcarrying wire exerts a magnetic force on
another such parallel wire. The magnitude F of the magnetic force is inversely
proportional to the distance between the centers of the wires, (1, and directly proportional
to the magnitude of current ﬂowing in each wire. If the wires carry the same magnitude
of current, I, then the magnitude of the force is proportional to the square of the current. 2
FocL,
Y1 01' :uoL 2
F:{2”y1]1 . (5) Mathematically, the force is attractive if the two wires carry currents in the same direction
and repulsive if the wires carry currents in the opposite directions. (7 pts) In the space provided below, accurately sketch the graph of force vs. current and the graph of
force vs. (current)2 based on the theoretical relationship above. F F 80 If you drew a straight line, what is the si ' W o/Fsv‘mce beiwwa 7%, 3. Using the provided graph paper on the next page
vs. current squared. (8 pts) 81 9 Lab 7 The Current Balance Force vs. Current Squared I I IIIII
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Ar é; : . €319“ t if? P Lab 7 The Current Balance 4. What is the slope of the line of best ﬁt to the force vs. current squared? You must do a
proper slope calculation, showing all work on the force vs. current squared graph,
including correct use of units. (10 pts) "6 A) a»
k=slope= L25“? [£35 5. Using equation 5, the graph F vs. 12, the length of the rods (L), and the permeability of
free space [#0 = 1.26 ><10'6 T 0 ﬂ) , ﬁnd the separation of the parallel rods, y1. (7 pts) . .y ' ~. WW» 3 Wm — M (3 i.» , 5,; Tam N
We » w... M... M. #1 Z 2’; ( :_//~' "g $ l
d:
a:
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How well do your results agree with the result of exercise 1 (percent difference)? law/z W — 03%; mi (DIHchw‘ﬁD:1‘gécéu) I Z 71¢ l3 claw. ‘34? agree}? w‘t'i’h +M. ran/alt 04° axe/mrriig U be gauge” i 7L of a" {Deva W 41:35; u»wa wk 6. An unknown amount of current ﬂows in the upper and lower bars of the current balance
used in the experiment. By trial and error, it is found that a mass of 55 mg returns the
upper bar to its equilibrium position. From the graph of current squared vs. force (a
calibration curve), what is the amount of current? Show all your work, including correct
use of units. (6 pts) ; f. H h
’fwc'mé‘ ,.
It “My” 7’ 83 Lab 7 The Current Balance Questions and Exercises 1. You are looking down from above on a long, straight wire carries a currenth as shown in the
ﬁgure below. (4 pts) P. ‘ Q
a. What is the direction of the magnetic ﬁeld at points P and Q that the current in the wire
creates?
left <— right —> up T down i into the page 69 C: out of the page® \\_.‘_h~w_ b. Which is greater, the magnitude of the magnetic ﬁeld at point Q or the magnitude of the
ﬁeld at point P, or is the magnitude of the magnetic ﬁeld the same at both points? L i " ﬂ: ‘3‘"! ‘ ;. '59:. ﬂ ,x a; s w 93,.
a1? ,0 ; ﬂ , ﬂ z” ‘9 ’ ’l ' new t .1 ~ , ‘ 5533,5536; 2. Four straight segments of wire are connected together to form a rectangular loop. The loop is
placed in the magnetic ﬁeld created by the current ﬂowing in the long straight wire such that
the wire and the loop lie in the same plane, with the wire parallel to the long sides of the
rectangle. The loop is then connected to a battery (connections and battery not shown) so
that a current IL ﬂows counterclockwise around the loop. Is the loop attracted to or repelled
ﬂom the wire?(16 pts) 84 Lab 7 The Current Balance a. What is the direction of the force that the magnetic ﬁeld of the currentcarrying wire exerts
on segment 12? left <— right —> up T /down in) into the page 69 out of the page® b. What is the direction of the force that the magnetic ﬁeld of the current—carrying wire exerts
on segment 23? M I / u...» left <— up T down i into the page 69 out of the page© c. What is the direction of the force that the magnetic ﬁeld of the currentcarrying wire exerts
on segment 34? left <— right ——> down i into the page (9 out of the page© d. What is the direction of the force that the magnetic ﬁeld of the currentcarrying wire exerts
on segment 41? right __, up T down i into the page 69 out of the page® e. Which is greater, the force that the magnetic ﬁeld of the current—carrying wire exerts on
segment 41 or the force on segment 23 or are the two forces equal in amount? t r W”? r r‘ x f. Which is greater, the force that the magnetic ﬁeld of the currentcarrying wire exerts on
segment 34 or the force on segment 12 or are the two forces equal in amount? 1‘ ! % rive! a 5‘ {:3 ape» V.“
I ’ 9‘ “‘ g. What is the direction of the net force that the magnetic ﬁeld of the currentcarrying wire
exerts on the rectangular current loop? left <— n'ght —> T ﬂy.) down 1 into the page 69 out of the page® J h. Is the loop attracted to or repelled from the wire? 4’ f f” , r
Knits»: r 42;“ 2;: . A 85 ...
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