(Number of excess electrons= 10^n, determine the value of n) Assume the average

Question

(Number of excess electrons= 10^n, determine the value of n) Assume the average length of the tapes is half their actual length, so 5 cm. Assume each strip of tape has a mass of 0.1 gram. Assume both strips were equally charged and the charge is located at the middle of the strip. Using F=ma, the values of g,k,e, and the equation for the electrical force (Coulomb's law), calculate an order of magnitude value for the number of excess electrons on one strip of tape. You will need to sum forces in the horizontal and vertical directions to obtain the necessary formula.

Explanation / Answer

let x be the excess electrons

Fy=0

mg=xkq^2/r^2

xq^2=2.72*10^-16

x=1.06*10^22

n=22

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