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For more information, please see full course syllabus of AP Physics C/Electricity and Magnetism
AP Physics C/Electricity and Magnetism Electric Field
In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically charged objects. The concept of an electric field was introduced by Michael Faraday. The electric field is a vector field with SI units of newtons per coulomb (N C−1) or, equivalently, volts per metre (V m−1). The SI base units of the electric field are kg·m·s−3·A−1. The strength of the field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume.
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1 answer
Last reply by: Richard Kennesson
Sun Mar 11, 2018 12:20 AM
Post by babu wanyeki on March 1, 2014
On the second extra example when he is finding the time he is assuming that the velocity is constant and doesn't consider the downward acceleration which would make the time bigger.
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Post by Werner Heisenberg on December 27, 2013
In extra example 1, did you forget to put the value of g (9.8) in the equation? or did I miss something out?
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Post by yannick Haberkorn on October 12, 2013
what if the permitivity of the vacuum = some number x for example 12 or three how would you apply the formula k*Q1*q2/r^2 ?
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Post by Troy Franckowiak on February 12, 2011
Great lectures :)
One question I have concerning electrostatic equilibrium: When you talk about making a cavity within a spherical conductor you say that no electric field exists within the cavity itself. However, could charge accumulate on the surface outlining the cavity of the sphere?