In The explanation, The Author states that when the Loop starts rising up the Electrons aren’t moving horizontally any longer etc etc .. And Basically states that The Magnetic field would now Oppose the flow of Charges but the Battery keeps it going, so the battery does the work not the Magnetic Field ..
What I wanna ask is “How Did the Loop Start moving up first ? Which force Did that ?” And It seems to me like the answer to that is the F = I(axB) force .. isn’t magnetic field having a workdone here ?
(I can Provide the Author’s Answer if you require)
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This is because of the electric force, if we take the frame of reference from electrons, then the magnetic field changes relative to them, which excites the electric field, which attracts them.
Ask if something is not understandable. I used the translator
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The question I ask is this way,
First, can Electric Field Do Work ?
People say “Yes”, Lets say a Charge (q) is placed in an Electric Field (E) , this Charge Experiences a motion in the direction of force (qE) due to Electric Field so One says “Oh Electric Field does Work” ..
Ok, so Now here in this problem, The Block Hangs because the magnetic Field Is present there and due to it a Force i(LxB) gets applied on the conductor .. So Why can’t we say that Magnetic field is Doing work Too ? If we Increase The magnetic Field Intensity the Hanging block moves up .. The force is applied in the upward Direction (by right hand rule) and in the same direction we are seeing the Entire setup rise, When They saw a charge Moving in The direction of The Force applied on it due to Electric Field they said “Electric Field Can Do Work” , but now when There motion in the direction of Force Applied on a Conductor due to Magnetic Field they won’t say that “Magnetic Field Can Do Work” ..
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look, the electric field does work, but the magnetic field does not. Why does the magnetic field not do work?: because the force vector is perpendicular to the motion
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But in this case The force vector doesn’t seem to be perpendicular to motion .. The Block rises up and The Force by Magnetic Field on the conductor is in The Upwards direction too ..
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Look, the magnetic force F equal to (vector multiplication) [B*v], so it’s perpedicular to both of them
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In this question, Isn’t it the force of Magnetic field which makes the System Hang and Further get carried upwards ?
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I think it will start turning over
If we count moments of force we will see that their sum won’t be equal to 0
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Yes it will, But It starts to turn over only after it moved a bit upwards, it gained an upwards velocity first then due to that The Magnetic Field Force starts to turn it over .. Which force made it get an upward velocity ?
Or just leave this case .
Consider the case of Two Wires which this Very Author Writes about, If Electric current flows in the same direction for two wires those two wires repel each other .. Use the right hand rule to find out What is the direction of force on Each wire, And Then see the motion .. Again Magnetic Field is Doing Work !
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I found the explanation in the book, which I read
(I. E. Irodov General Course of Physics, Volume 2, Electromagnetism (И. Е. Иродов общий курс физики, 2 том, электромагнетизм)) (you can find it in telegram chanel with name Physics Book):
The translated version of the pages 232-233:
The original of the pages 232-233:
The original language is Russian
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