Earth’s magnetism and the magnetic field of current
Answers are for parents and teachers.
1
400 turns, length 20 cm. Turns per cm?
20
2
What was the result of Oersted’s experiment? One sentence.
A magnetic needle beside the current-carrying wire deflected.
3
Write the gimlet rule in your own words.
If the gimlet advances along the current, its handle turns in the direction of the field lines.
4
What causes the polar lights?
Charged particles from the Sun make gases in the upper atmosphere glow.
5
Write two safety rules for experiments with current.
Only with the teacher and a low-voltage source; never connect to the mains and switch on briefly.