https://youtu.be/fUH59HbnM70
2.magentic lines of force
https://youtu.be/VdeRwOqJdLQ
3.solenoid
https://youtu.be/65v6uWOc3u4
13.9 activity emi by double coil
https://youtu.be/OTHvwJfARWE
Differences between ac and dc
https://youtu.be/0mLC2j_oirc
All rules in magnetism lesson and their use
https://youtu.be/IK3BsfA9NQs
Earth wire
https://youtu.be/bmAC5pFYhiM
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