Number 9 please A physicist uses a positively charged rod to give a metal sphere
ID: 1551581 • Letter: N
Question
Number 9 please
A physicist uses a positively charged rod to give a metal sphere a negative charge. Did the physicist charge by conduction or induction? An ion has more protons than electrons. What is the sign of its electrical charge? Two charged objects (one positive and one negative) are held apart with a long bar: If the charge of these two objects does not change even after a long time, is the bar made of an insulator or a conductor? When we use Coulomb's Law to calculate the force that exists between two charges which are free to move, we say that we are calculating the instantaneous electrostatic force. Why must we say "instantaneous." Two charged objects are isolated in space. The charge on the positive object is twice the charge on the negative object. If the positive object exerts a 5.0 N force on the negative object how much force does the negative object exert on the positive one? Two charged objects are held in place and the electrostatic force between them is measured. If, suddenly, half of the charge is taken out of one of the objects, what happens to the magnitude of the force? Two charged objects are held in place and the electrostatic force between them is measured. If, suddenly, the distance between the objects is halved, what happens to the magnitude of the force? A +2.1 C charge is placed 45 cm from a -9.3 C charge. What is the force between them? Is it attractive or repulsive? Two charged objects that are 1.2 m apart experience a repulsive instantaneous electrostatic force of 4.3 times 10^5 Newtons. If one of the objects is charged at +3.1 mC, what is the charge (include the sign) of the other object?Explanation / Answer
F = kq1q2 / r^2
given:-
F = 4.3 x 10^5 N
r = 1.2 m
q1 = 3.1 x 10^-3 C
k = 9 x 10^9
(4.3 x 10^5) = (9 x 10^9 x 3.1 x 10^-3 x q2) / (1.2)^2
q2 = (4.3 x 10^5 x 1.44) / (9 x 10^9 x 3.1 x 10^-3)
q2 = (6.192 x 10^5) / (2.79 x 10^7)
q2 = 2.22 x 10^-2 C
q2 = 0.222 mC
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