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3. a) What is the definition of electric field? Why is this for a 'test charge'? b) What is an electric field line? Why do

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3. a) What is the definition of electric field? Why is this for a 'test charge'? b) What is an electric field line? Why do they have arrows? How can you tell where an E-field is strongest by looking at the field lines? c) Combine Coulomb's Law and the definition of electric field to find an equation for the field strength, E, a distance r from the centre of a charged sphere of charge

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