We find in Nature certain stuffs which are magnetic. Fe - Ni - Co are naturally magnetic. And magnetite - an iron ore - is magnetic. In fact -everything is magnetic to some degree - some things more - some less. The reason for this is clear: The primordial origin of magnetic forces lies in the motion of electrons. In some stuffs the magnetic domains are more abundant than in others.

A - How can we make a magnet: Answer: Hold a magnetizable bar - like an iron bar -in the Earth's magnetic meridian. Give it a proper "dip". Now strike it sharply with a hammer... at one end. The bar is - presto! magnetized! A wonderful thing really. We can check this by approaching a compass needle with one end of the bar just magnetized. If the needle is repel led the bar IS magnetized. Only repulsion proves this. Attraction does not! The reason is clear: A bar of magnetic stuff unmagnetized will attract a compass needle. See why?

B - How else can we make a magnet? Answer: Wrap a coil of wire around a magnetic stuff - like an iron rod say. Energize the coil with an electric current. The bar becomes polarized. It is a magnet. This results from the fact that a current-bearing conductor gives rise to a magnetic field. . .discovered by Oersted in 1820.

C - How else can we make a magnet? Stroke a bar of iron - say - with a chunk of magnetite or with another magnet. The polarity of the sample magnetized is governed by the pole last leaving the sample.

D - Problem: We magnetize a sample of stuff - say an iron rod. It has a certain "pole strength". That is to say: it is so strong. Now we break this bar just magnetized. The pieces each become a complete magnet with their own poles. Question: What is the pole strength of each piece? A very good question. HINT: We do work to break the original magnet. THIS energy must play some role somewhere.

E - Problem: We have two identical bars - absolutely identical - or so they look. One however is magnetized - the other is not. How can we determine which is the magnet without any accessories whatsoever? No strings to hang them on - no needles to try - nothing at hand. We are free however to handle both bars with utter freedom. HINT: The influence of a bar magnet is largely concentrated at the ends. Need we say more?
F - Question: Is stainless steel magnetic? Answer: No. And so we ask further: Why?

G - How can we protect a region or a thing from magnetic influence? That is - how can we insulate against magnetism? We explore this with numerous stuffs - Al - Zn - Cu - wood - lucite - and so on. And we find that magnetic insulation is best accomplished by surrounding the thing we wish to protect with a proper thickness of soft iron.

H - We explore the region around an arrangement of bar magnets by
sprinkling iron filings. The forms which come to light are enchanting to see.

1. The Idea of the Center of Gravity
2. Newton's First Law of Motion: Inertia
3. Newton's Second Law of Motion: The Elevator Problem
4. Newton's Third Law of Motion: Momentum
5. Energy and Momentum
6. Concerning Falling Bodies & Projectiles
7. The Simple Pendulum and Other Oscillating Things
8. Adventures with Bernoulli: Bernoulli's Principle
9. Soap Bubbles and Soap Films
10. Atmospheric Pressure
11. Centrifugal Force and Other Strange Matters
12. The Strange Behavior of Rolling Things
13. Archimedes' Principle
14. Pascal's Principle: The Properties of Liquids
15. Levers, Inclines Planes, Geared-wheels and Other Machines
16. The Ideas of Heat and Temperature
17. Thermometric Properties and Processes
18. How to Produce Heat Energy
19. Thermal Expansion of Stuff: Solids
20. Thermal Expansion of Stuff: Gases & Liquids
21. The Strange Thermal Behavior of Ice and Water
22. Heat Energy Transfer by Conduction
23. Heat Energy Transfer by Convection
24. Heat Energy Transfer by Radiation
25. Evaporation, Boiling, Freezing: A Dramatic Adventure
26. Miscellaneous Adventures in Heat
27. The Drama in Real Cold Stuff: Liquid Nitrogen
28. The Physics of Toys: Mechanical
29. The Physics of Toys: Acoustic and Thermal
30. Waves: Kinds of Properties
31. Sound Waves: Sources of Sound & Pitch and Frequency
32. Vibrating Bars and Strings: The Phenomenon of Beats
33. Resonance: Forced Vibrations
34. Sounding Pipes
35. Vibrating Rods and Plates
36. Miscellaneous Adventures in Sound
37. Electrostatic Phenomena: Foundations of Electricity
38. Electrostatic Toys, Part 1
39. Electrostatic Toys, Part 2
40. Adventures with Electric Charges
41. Adventures in Magnetism
42. Ways to "Produce" Electricity
43. Properties and Effects of Electric Currents
44. Adventures in Electromagnetism
45. Further Adventures in Electromagnetism
46. Miscellaneous and Wondrous Things in E&M

Demonstrations in Physics was an educational science series produced in Australia by ABC Television in 1969. The series was hosted by American scientist Julius Sumner Miller, who demonstrated experiments involving various disciplines in the world of physics. The series was also released in the United States under the title Science Demonstrations.

This program was a series of 45 shows (approximately 15 minutes each) on various topics in physics, organized into 3 units: Mechanics; Heat and Temperature / Toys; and Waves and Sound / Electricity and Magnetism.