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3B SCIENTIFIC ® PHYSICS
Instruction sheet
02/08 ALF
1. Description
The auxiliary is used to create a magnetic field per-
pendicular to the axis of a tube. When used in con-
junction with the Helmholtz pair of coils D and S
(U191051 and U185051) and the Perrin tube D and S
(U19154 and U18554) two orthogonal magnetic
fields can thus be generated at right angles to the
tube axis to demonstrate the basic principles of a
cathode ray oscilloscope.
The air filled coil is made of lacquered copper wire
on a plastic bobbin with a lip for securing to the
fork of the tube holder D (U19100). Connections are
labelled from the start (A) to the end (Z) of the coil
winding.
2. Technical data
Number of windings:
Maximum current:
Effective resistance:
Connection:
Auxiliary Coil U19106
1000
2 A (short term)
7 Ω approx.
via 4-mm sockets
3.1 Set-up of the auxiliary coil on the tube
holder D (U19100)
•
Insert a hot cathode tube into the tube holder
D.
•
Place the coil on the upper fork of the tube
holder (refer to Fig.1).
•
Push the retaining slider over the lip of the
auxiliary coil to secure the coil in place.
3.2 Set-up of the auxiliary coil on the tube
holder S (U185001)
•
Connect up the coil using experiment leads.
•
Place the coil on the ramp of the tube holder S
so the plugs slide into the corresponding slot
(refer to Fig.2).
•
The leads may be trailed through the mouth of
the ramp.
•
Insert a hot cathode tube into the holder.
1
1 Coil
2 4-mm-sockets
3. Operation
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