http://physics.bu.edu/~duffy/Ejs/EP_chapter17/EField_and_Potential_2D_v2_Intro%201.html
k = 9*10^9
Q = 20 C
R = 0.30 meter
E = k Q/R^2
Why on earth are you asking this if taking the subject?
Calculate the electric field intensity 30cm from a point of charge 20C
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2 answers