What is the magnitude of the force a + 25 times 10^-6 C charge exerts on a +2.5t

Question

What is the magnitude of the force a + 25 times 10^-6 C charge exerts on a +2.5times 10^-3 C charge 1.6 times 10^-1 m away? 2.2 times 10^4 N 1.0 times 10^4 N 8.8 times 10^6 N 2.6 times 10^9 N 6.6 times 10^4 N when an object such as a plastic comb is charged by rubbing it with a cloth the charge is typically a few micro coulombs. If that charge is 4.0 times 10^-6 C, by what percentage does the mass of a 9.0 times 10^-3 kg change during charging? 2.3 times 10^-16% 2.5times10^-15% 1.9times 10^-15% 2.5 times 10^-13% 1.9 times 10^-13% Determine the magnitude and direction of the electric force on an electron in a electric field of strength 2460 N/C that points due east. 3.94 times 10^-16 N, west

Explanation / Answer

2) The electric force between two charged particles can be calculated using below formula,

  F = k*q1*q2 / r^2

Where, k = 9*10^9 N*m^2 / C^2

r = 1.6 * 10^-1 m, q1 = 25*10^-6 C, q2 = 2.5*10^-3 C

Using above values,

F = ( 9*10^9 * 25*10^-6 * 2.5*10^-3 ) / (1.6 * 10^-1)^2 = 2.1973 * 10^4 N

=> F = 2.2 * 10^4 N ...............Option no (a)

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