3B Scientific Induction Apparatus User Manual

3B SCIENTIFIC
Induction apparatus U8496270
Operating instructions
05/08 SP/ALF
®
PHYSICS
1 Operating voltage terminals 2 Pole changeover switch 3 Basic instrument 4 Frame with coil 5 Magnet plate 6 Conveyor belt
1. Description
The induction apparatus allows demonstration and investigation of an induced voltage resulting from the motion of a coil wound onto a frame passing over a plate of magnets. By varying the coil frame's speed and the number of turns in the coil itself, the law of induction can be quantifiably verified by ex­periment. The rolling motion of a current carrying conductor can also be demonstrated in the magnetic field of the magnet plate of this apparatus.
The coil is moved at a constant speed over the mag­net plate by a motor driving a belt. This produces a constant induction voltage. The direction of the coil's movement can be reversed using a switch and the speed can be varied via the operating voltage. The transparent design of the magnet plate and the frame with coil allows the equipment to be used in combination with an overhead projector.
2. Contents
1 Basic instrument 1 Frame with coil 1 Plate of magnets 1 Brass tube 1 Fleece
3. Technical data
Frame with coil: 185 x 125 mm² Coil taps: 800, 1600. 2400 turns Total dimensions: 585 x 200 x 55 mm³ Operating voltage: 2 – 12 V DC Connection terminals: 4-mm safety sockets Weight: 3 kg approx.
1
4. Sample experiments
4.1 General instructions
The following equipment is also needed for the ex­periments:
1 DC power supply, 1,5 – 15 V U8521121-115 or 1 DC power supply, 1,5 – 15 V U8521121-230
1 Measurement amplifier U8531401-115 or 1 Measurement amplifier U8531401-230
1 Multimeter ESCOLA10 U8531160 1 HF patch cord, BNC/4 mm plug U11257
Before beginning an experiment, the metal
tracks on the basic instrument, under the frame with coil and on the plate of magnets, as well as the brass tube must be rubbed with the fleece to ensure good electrical contact.
Set up the induction apparatus either on top of
an an overhead projector or on a bench.
4.2 Movement of a current-carrying conductor in a magnetic field
Remove the magnet plate from the induction
apparatus.
Place the brass tube across the magnet plate so
that the left and right-hand ends of the tube touch the metal rails.
Connect the magnet plate to the mains adaptor,
and feed 1 to 2 A into the sockets.
The brass tube starts to roll over the
magnet plate by
the Lorentz force acting on the current conducting electrons in the tube. If the poles of the voltage source are reversed the direction of the tube's mo­tion is also reversed.
1 A-2 A
Place the brass tube across the magnet plate so
that the left and right-hand ends of the pipe touch the metal rails.
While applying a slight downward pressure to
the brass tube, move it at a constant speed through the magnetic field.
The voltmeter indicates a certain DC voltage. If the tube's direction is reversed, an voltage of similar magnitude arises with the opposite polarity. If the speed is increased, the voltage rises too.
μ
V
Fig. 2 Electrical induction with a conductor
4.4 Electrical induction with a flat coil
Place the frame with coil on the induction appa-
ratus.
Connect the induction apparatus to the power
supply.
Connect the multimeter to the coil. Set the zero
point at the middle of the scale and select the 100 mV measurement range.
Slowly increase the operating voltage until the
conveyor belt slowly moves at a constant speed.
Observe the induced voltage.
The voltmeter indicates a DC voltage. If the direction of the conveyor belt is reversed, a voltage of similar magnitude arises with the opposite polarity.
If the whole coil is located above the magnetic field, there is no voltage induced. The coil surface is smaller than the surface of the magnet plate, thus the magnetic flux remains constant.
Fig. 1 Motion of a current-carrying conductor in a mag-
netic field
4.3 Electrical induction with a conductor
Remove the magnet plate from the induction
apparatus
Connect the signal amplifier to the sockets of the
metal tracks and set the measurement range to 100 μV.
mV
V
Fig. 3 Electrical induction using a flat coil
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