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## Physics library

### Course: Physics library>Unit 18

Lesson 5: Discovery of electromagnetism

# Electromagnetic field (forward vs. reverse)

Apply current in both directions and notice the response is different. Created by Brit Cruise.

## Want to join the conversation?

• Does the needle spin in different directions because the flow of electrons is different? Or is it because of something else?
• In this situation, the current is flowing in the opposite direction from situation A to situation B. If you watch Sal's videos on magnetism, you will learn that opposite current means opposite magnetic field.
• at the compass move clockwise.However at when the battery changed and the crocodile wire changed its position, the compass move counter clockwise. Why is it so?
• Beacuse you've changed the whole current direction, so it caused a change in way. Check right hand rule for more.
• Why is there tape below the compass?
• The tape is there only to elevate the compass, so the wire can pass underneath.
(1 vote)
• At , is counterclockwise more powerful? It looks that way from the video.
• Do electromagnets have north and south poles? I think so but thought I'd check...
And if so, than wouldn't it behave differently than with normal magnets?
• why isn't the battery shorting out from this?
(1 vote)
• What if you DON'T notice the response is different?