# OCR g485 magnetic fields question- help!Watch

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#1
Can someone explain 4bi and 4bii from this paper please?

http://www.ocr.org.uk/Images/81115-u...s-specimen.pdf

I'm really struggling with these

Thank you

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5 years ago
#2
(Original post by Clemclem)
Can someone explain 4bi and 4bii from this paper please?

http://www.ocr.org.uk/Images/81115-u...s-specimen.pdf

I'm really struggling with these

Thank you

You should know this is an application of Faraday's law.

Can you state the appropriate equation relating e.m.f., magnetic flux, conductor length and velocity of a straight length of wire moving through a constant magnetic field?

This equation is for a single length of conductor.

Clue: But notice that the coil of 1250 turns is in the form of a square and therefore straight edged and notice the position of the coil wrt to the field. Close inspection of the dimensions of both the field and coil position are needed.

Put the two pieces of information together and you have your answer to part 4b (i).

4b(ii) is an extension of this. Think about how the edges of the coil cut the magnetic field as the coil first enters and then moves through the field. You will need to picture and apply Flemings left hand rule.
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