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may I ask why the string will pull the copper bar ? I thought the iron bar will attract the iron bar upward and the copper bar gets pulled along upward instead of to the right by the spring?

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When a magnet is cut into two, will the two resultant smaller magnets be weaker than the original? And if they are cut into different sizes, will the bigger one be stronger than the smaller one?

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Alex: For this Q5, I thought the magnet is being withdrawn in the south direction…?

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Alex: For this Q5, I thought the magnet is being withdrawn in the south direction…?

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Why is it that when demagnetizing an electromagnet have to place in E-W direction? And also why does it have to be slowly drawn out with alternating current still flowing in the solenoid until it is some distance away?

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Why the answer to Q3 is B and not D

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why is the answer C? i thought the SLS says that the north pole of the compass needle is attracted to the magnetic south of the Earth which is the Earth’s geographical North? So shouldn’t the magnet at the pointer be the South seeking pole instead?

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Shanice: Exercises at the back of the Magnetism notes, Q3

Why is the magnetic field strength strongest at Q than at P or R which are on the line itself?

And how do you judge the strength, like if Q wasn’t an option would S be the greatest then?

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Why do magnetic field lines run from North to South?

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When demagnetising a magnet using the electrical method, why must the magnet be removed in the East-West direction?

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How to solve Q27?

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How to solve Q28?

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May i check if nickel and cobalt are soft magnetic materials?

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Note: red in this diagram is "south pole"

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Does the magnetic field lines play a part in this. Like the direction of the arrows from north to south (does it mean anything in this situation).

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How does the magnetic field lines from magnet impact this? And why the difference between the top of bar n bottom of bar.

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Is there a more logical explanation, like is it affected by the poles of the magnet?

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Fig. 2: The side labelled N is clockwise?

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Why A?

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What does the magnetic field mean though? Like it’s pointing towards the south because of the direction of the arrow?

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I don’t really get these 2 questions.

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Laura: demagnetisation - Why is it that when the magnet is slowly withdrawn from the solenoid, the ac needs to be still flowing in the solenoid

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Nellie:
Q41 (why answer cannot be D), Q 28, Q67 thank you!

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The answers for example 17.2 include drawing X the neutral point. Is it necessary to draw it?