3B Scientific Coil with Variable Number of Turns per Unit Length - Manual (Page 2)

Elwe Didactic GmbH ▪ Steinfelsstr. 5 ▪ 08248 Klingenthal ▪ Germany ▪ www.elwedidactic.com
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ germany ▪ www.3bscientific.com
Subject to technical amendments
© Copyright 2012 3B Scientific GmbH
5. Sample experiments
For the experiment the following additional devi-
ces are required:
DC-power supply
0 - 16 V, 0 - 20 A 1002771
3B NETlog™ (115 V, 50/60 Hz) 1000539
or
3B NETlog™ (230 V, 50/60 Hz) 1000540
Magnetic Field Sensor ±100 mT 1000558
Stand for Cylindrical Coils 1000964
5.1 Confirmation of equation 1
• Put the coil on the stand and connect it to
the power supply unit.
• Switch on the power supply unit and adjust
the currentto approx. 10 A.
• Measure the magnetic flux density B with
the magnetic field sensor.
• Determine the length of the coil and use
equation (1) to calculate the theoretical va-
lue for B.
• Repeat the measurement with different coil
lengths.
• Compare the calculated values with the
measured ones.
5.2 Determination of the magnetic field con-
stant μ
0
• Measure the magnetic flux density B with
different coil lengths l.
• Record the values in a table and plot B as a
function of 1/L in a coordinate plane.
The slope m corresponds to the product
L
n
⋅ μ
0
.
Hence
n
L m
⋅
= μ
0
(2)
Fig. 1 Experiment set-up