Question 395437
An electrically charged particle generates an electric field around it. 
The strength, E, of the electric field (in NC^-1) is directly proportional to the size of the charge on the particle, Q (in Coulombs, C), and inversely proportional to the square of the distance from it, d, in metres.
(i) Set up the proportional relationship.
Which I think is E=k sqrt Q/d is this correct
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No: E = k*Q/d^2
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(ii)Find the constant of proportionality if the electric field strength 3.00cm from a 3.5uC charge is 3.5*10^7 NC^-1
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3.5*10^7 = k*3.5/3^2
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k = 9(3.5*10^7)/3.5
k = 9*10^7
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Cheers,
Stan H.