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Chapter 23: Q. 3 (page 653)
The electric field strength from a very long charged wire is . What is the electric field strength from the wire?
The electric field strength at from the wire is.
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An electric field can induce an electric dipole in a neutral atom or molecule by pushing the positive and negative charges in opposite directions. The dipole moment of an induced dipole is directly proportional to the electric field. That is, , where is called the polarizability of the molecule. A bigger field stretches the molecule farther and causes a larger dipole moment.
a. What are the units of ?
b. An ion with charge is distancefrom a molecule with polarizability . Find an expression for the force .
FIGURE is a cross section of two infinite lines of charge that extend out of the page. The linear charge densities are . Find an expression for the electric field strength at height above the midpoint between the lines.
FIGURE shows a hollow soda straw that has been uniformly charged with a positive charge. What is the electric field at the center (inside) of the straw? Explain.
The electric field strengthfrom the surface of adiameter metal ball is. What is the charge on the ball?
Reproduce FIGURE Q23.2on your paper. For each part, draw a dot or dots on the figure to show any position or positions (other than infinity) where .
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