A-Level Notes > Bishop Vesey's Grammar School A-Level Notes > AQA PHYA4 - Fields and Further Mechanics Notes
Topic 5 Magnetic Fields Notes
This is a sample of our (approximately) 4 page long Topic 5 Magnetic Fields notes, which we sell as part of the AQA PHYA4 - Fields and Further Mechanics Notes collection, a A* package written at Bishop Vesey'S Grammar School in 2014 that contains (approximately) 16 pages of notes across 5 different documents.
The original file is a 'Word (Docx)' whilst this sample is a 'PDF' representation of said file. This means that the formatting here may have errors. The original document you'll receive on purchase should have more polished formatting.
Topic 5 Magnetic Fields Revision
The following is a plain text extract of the PDF sample above, taken from our AQA PHYA4 - Fields and Further Mechanics Notes. This text version has had its formatting removed so pay attention to its contents alone rather than its presentation. The version you download will have its original formatting intact and so will be much prettier to look at.
Topic 5: Magnetic Fields 1
Current carrying conductors in magnetic fields a Magnetic flux density is the magnetic force per unit length per unit current on a current-carrying conductor placed perpendicular to the magnetic field lines i A Tesla is the magnetic flux density if a 1m length of wire carrying a current of 1A experiences a magnetic force of 1N, when placed in the field in such that the current flows perpendicular to the magnetic field lines b Current-carrying wires in a magnetic field will experience a force perpendicular to the field lines and to the flow of the current:
Force is greatest when current flows perpendicular to the field lines ii Force is weakest when current flows parallel to the field lines Fleming's left hand rule for motors i Thumb = motion ii First finger = field lines iii Second finger = conventional current
Moving charges in magnetic fields a Moving charges in a magnetic field will experience a force perpendicular to the field lines and to the flow of the current:
Force is greatest when velocity is perpendicular to the field lines ii Force is weakest when velocity is parallel to the field lines Uniform magnetic fields: Circular motion (F=BQv) i Due to Fleming's Left Hand rule, the magnetic force acts at right angles to the direction of motion of the electron ii As F=BQv, the magnitude of the magnitude force will remain constant but as the magnetic force remains at right angles to the direction of motion, even when there is a change of direction, the magnetic force is a centripetal force iii As a result, the path of the charge will be circular and the radius of the circular path will be
Uniform electric fields: Parabolic motion (F=EQ) i Due to the potential difference between the plates, the electric force will act downwards ii As a result, the electric force increases the charge's vertical component of velocity but leaves the charge's horizontal
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