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P5.1 - Fields

Electric & Magnetic Fields - OCR A2 Physics

QuestionAnswer
Define an Electric Field: An electric field is a region in which a charged object experiences a force.
Define Electric Field Strength: The electric field strength at a point is the force exerted by an electric field on one coulomb.
Define Gravitational Field: An area in which objects with mass experience a force.
What is Fleming's Left Hand Rule? Thumb: Force Forefinger: Field Middle finger: Current
What is a Solenoid? A cylindrical coil of wire that acts a magnet whilst carrying an electrical current.
What is 1 Tesla? The magnetic field strength which causes a force of 1N in a wire of length 1m in the field carrying 1A.
What is the Right Hand Grip rule? Thumb: Direction of current Curl of fingers: Direction of field
What is a mass spectrometer? A device that is used to discover what elements are present in a given sample.
What does a mass spectrometer do to find out what elements are present? Atoms of a sample are boiled. Atoms are ionised. A powerful electric field accelerates them. A magnetic field is applied perpendicular to the motion of the particles (the atoms are now deflected). The lighter a particle, the smaller the curve.
What does VIADD stand for? Vaporisation, Ionisation, Accelerate, Deflect, Detection.
What is Induction? The production of an Electromotive Force across a conductor by its relative motion through a magnetic field.
What is Lenz's Law: When a current is induced, it flows in such a way, as to create a magnetic field that opposes the change that created it.
What is Faraday's Law: The EMF induced is proportional to the rate of change of flux.
Created by: Sparksy