3B Scientific Induction Apparatus User Manual

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3B SCIENTIFIC® PHYSICS

Induction apparatus U8496270

Operating instructions

05/08 SP/ALF

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.

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3B Scientific Induction Apparatus User Manual

4.Sample experiments

4.1General 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.

4.2Movement 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

Fig. 1 Motion of a current-carrying conductor in a magnetic 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.

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.

μV

Fig. 2 Electrical induction with a conductor

4.4 Electrical induction with a flat coil

Place the frame with coil on the induction apparatus.

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.

mV

V

Fig. 3 Electrical induction using a flat coil

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