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# lab28 - LAB 28 MAPPING THE ELECTROSTATIC POTENTIAL ELECTRIC...

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LAB# 28: MAPPING THE ELECTROSTATIC POTENTIAL & ELECTRIC FIELD INTRODUCTION: The field concept is very useful in describing interactions between particles. We are concerned with the electric and magnetic fields associated with the interaction of charged particles. Interactions between charges at rest are described in terms of electric field and electric potential. Forces between moving charges are traditionally described in terms of magnetic fields; any charges in motion relative to a given frame of reference, or any current, produces a magnetic field. A charge moving through that field experiences a velocity-dependent magnetic field force. Denoting the electric and magnetic fields as E and B, and the particle charge by q, we represent the total force F on the charge when its moving with velocity v by: F = q ( E + v x B ) (1) which is called the Lorentz force law . A magnetic field which varies with time produces an electric field; this is electromagnetic induction and is described by Faraday`s law of induction . Similarly, a time-varying electric field produces a magnetic field. We wish to demonstrate the magnetic field produced by the an electric current. This will show the general relationship between currents and magnetic fields. In cases where the fields are two-dimensional it is convenient to use conducting paper. Each conducting electrode forms an equipotential surface and if a potential difference (Voltage!!) is imposed on the two electrodes an electric field is established in the regions between them. We will experiment on several configurations of conducting paper.

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