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P5.1 - Fields
Electric & Magnetic Fields - OCR A2 Physics
Question | Answer |
---|---|
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. |