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Chapter 20: Problem 14
A typical lightning flash delivers about 25 C of negative charge from cloud to ground. How many electrons are involved?
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Why should there be a force between two dipoles, which each have zero net charge?
Protons and neutrons are made from combinations of the two most common quarks, the \(u\) quark (charge \(+\frac{2}{3} e\) ) and the \(d\) quark (charge \(-\frac{1}{3} e\) ). How could three of these quarks combine to make (a) a proton and (b) a neutron?
Show that the electric field at a point \(45^{\circ}\) from a dipole's axis is \(1 / \sqrt{5 / 8}\) times the field on the axis, assuming both points are the same distance from the dipole and that distance is large compared with the dipole spacing.
Three identical charges \(+q\) and a fourth charge \(-q\) form a square of side \(a\). (a) Find the magnitude of the electric force on a charge \(Q\) placed at the square's center. (b) Describe the direction of this force.
A 68 -nC charge experiences a 150 -mN force in a certain electric field. Find (a) the field strength and (b) the force that a \(35-\mu C\) charge would experience in the same field.
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