PLEASE SHOW ALL WORK. THANKS! How many electrons must be removed from an initial
ID: 1433148 • Letter: P
Question
PLEASE SHOW ALL WORK. THANKS!
How many electrons must be removed from an initially neutral disk to give it a net charge of +2.1 C?
Answer:
A metal sphere has an initial charge of +6.0 C. What is the net charge of the sphere after 4.7×1013 electrons have been placed on it?
Answer:
A plate carries a charge of 2.4 C, while a rod carries a charge of -1.6 C. How many electrons must be transferred between the plate and the rod so that they have the same charge?
Answer:
A system of two charges, q1 = 8.3 C and q2 = 2.1 C has the charges a distance 113.0 cm apart. Calculate the magnitude of the electrostatic force between these two charges.
Answer:
Two small, identical spherical conductors carry charges of 7.5 C and 0.8 C. They are separated by a distance of 132.0 cm. Calculate the magnitude of the electrostatic force between these two spheres.
Answer:
Is the force between the spheres in the above problem attractive or repulsive? (Enter A for attractive or R for repulsive -- 1 attempt ONLY)
Explanation / Answer
1)
electric charge Q = ne
n = Q/e = (2.1*10^-6)/(1.6*10^-19)
n = 1.3125*10^13
+++++++++++++++++++++++++++
2)
q1 = 6 uC
q2 = -n*e = -4.7*10^13*1.6*10^-19 = -7.52 uC
q = q1 + q2 = 6 - 7.52 = -1.52 uC <<<<---------answer
_________________
3)
q1 -q = q2 + q
2q = q1 + q2
q = (2.4-1.6)/2 = 0.4 uC
q == n*e
n = q/e = (0.4*10^-6)/(1.6*10^-19)
n = 2.5*10^2 electrons
_________
4)
F = k*q1*q2/r^2
F = (9*10^9*8.3*10^-6*2.1*10^-6)/(1.13^2)= 0.123 N
__________
5)
F = k*q1*q2/r^2
F = (9*10^9*7.5*10^-6*0.8*10^-6)/(1.32^2)= 0.031 N
R
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