*****QUESTION IS PART B***** Two small identical conducting spheres are placed w
ID: 1523830 • Letter: #
Question
*****QUESTION IS PART B*****
Two small identical conducting spheres are placed with their centers 0.48 m apart. One is given a charge of 12 109 C, the other a charge of 19 109 C.
(a) Find the electrostatic force exerted on one sphere by the other.
magnitude: 8.9×10^(-6)
direction: attractive
(b) The spheres are connected by a conducting wire. Find the electrostatic force between the two after equilibrium is reached, where both spheres have the same charge.
magnitude __ N
direction: attractive or repulsive?
Explanation / Answer
let q1 = 12*10^-9 C
q2 = -19*10^-9 C
a) F = k*q1*q2/d^2
= 9*10^9*12*10^-9*(-19*10^-9)/0.48^2
= -8.9*10^-6 N
|F| = 8.9*10^-6 N
direction : attractive(negaitve sign represents the force is attractive)
b) when the spheres are connected,
q1' = q2' = (q1 + q2)/2
= (12 - 19)*10^-9/2
= -3.5*10^-9 C
F' = k*q1'*q2'/d^2
= 9*10^9*(-3.5*10^-9)*(-3.5*10^-9)/0.48^2
= 4.8*10^-7 N <<<<<<<<<<<<----------------Answer
direction : repulsive <<<<<<<<<<<<----------------Answer
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