Magnetism 9.1 The Magnetic Effect Of A Current-Carrying Conductor

Science - Physics - Electricity and Electronics - 9 Electromagnetism
(P1375500)

9.1 The magnetic effect of a current-carrying conductor
Experiment by: MAGNETISM Printed: Jan 10, 2011 1:03:14 PM interTESS (Version 10.03 B132, Export 1678)

Task

Task
Does electric current also exert magnetic effects?
1. Use a compass needle to examine whether a straight conductor which is carryingcurrent exerts a magnetic effect. 2. Demonstrate that a coil which carries current acts like a bar magnet, and examine on what the strength of its magnetic field is dependent.

Use the space below for your own notes.

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Material

Material
Material from "Student equipment set electricity/electronics1" (Order No. 05600.88) and Material from "Student equipment set electricity/electronics 2" (Order No. 05601.88)
Position No.
1 2 3 4 5 6 7 8 9 10 11 12 13 16 Additional Material 14 15 Multi-range meter, analogue Power Supply, 0...12 V DC/ 6 V, 12 V AC White paper (DIN A4) Ruler (approx. 30 cm)
07028.01 13505.93

Material
Connector, straight, module SB Connector, angled, module SB Connector,interrupted, module SB Junction, module SB Switch on/off, SB Coil, 400 turns Coil, 1600 turns Yoke Drawing compass, 2 pieces Connecting cord, 32 A, 250 mm, red Connecting cord, 32 A, 250 mm, blue Connecting cord, 32 A, 500 mm, red Connecting cord, 32 A, 500 mm, blue Bar magnet, l = 72 mm

Order No. Quantity
05601.01 05601.02 05601.04 05601.10 05602.01 07829.01 07830.01 07833.00 06350.0207360.01 07360.04 07361.01 07361.04 07823.00

2 2 2 2 1 1 1 1 1 piece 2 2 1 1 1

1 1 1 1

Material required for the experiment

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Setup

Setup
First experiment
Set up the circuit as shown in Fig. 1 and Fig. 2. Plug a short connecting cable in the junction connector building blocks so that it lies along the North-South direction. Set the limiting current of the power supply to 2A.

Fig. 1

Fig. 2

Second experiment
Draw two lines at right angles to each other on the sheet of paper, then position the compass on it so that the pivot of the compass needle lies directly above the point of intersection of the lines. Turn the sheet of paper until the compass needle lies along the shorter line and mark the ends of this line N and S (see Fig. 4). Place the bar magnet onthe sheet of paper at a distance of about 10 cm from the compass needle and mark two field lines on the paper (Fig. 3 and Fig. 4).

Fig. 3

Fig. 4

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Third experiment
Set up the circuit as shown in Fig. 5 and Fig. 6, with the switch first open; connect the coil with 1600 turns between the two long connecting cables and select the 300 mA measurement range. Remove the bar magnet andreplace it, in the same position, with the coil. Bring the compass back into its original position (above the intersection of the lines) and rearrange if necessary.

Fig. 5

Fig. 6

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Action

Action
First experiment
• Set the power supply to 0 V and switch it on. • Close the switch and increase the voltage until the control lamp on the power supply lights up. • Open the switch and holdthe compass directly under the connecting cord which lies North-South. • Close the switch and observe the compass needle. • Open and close the switch several times while observing the compass needle, and note what you observe under (1) on the Results page; in addition, make a sketch of the position of the compass needle ( ) relative to the straight conductor (+ — –). • With the switch closed,hold the compass directly over the straight conductor (connecting cord) and observe the compass needle as shown in Fig. 6. Note your observation under (2), and sketch the present position of the compass needle relative to the straight conductor. • Lift the compass higher and higher and observe the deflection of the compass needle; hold the compass directly under the straight conductor and move it...