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Chapter 23: Q. 30 (page 654)
An electron in a vacuum chamber is fired with a speed of toward a large, uniformly charged plate away. The electron reaches a closest distance of before being repelled. What is the plate鈥檚 surface charge density?
The plate鈥檚 surface charge density is
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Honeybees acquire a charge while flying due to friction with the air. A bee with a charge of experiences an electric force in the earth鈥檚 electric field, which is typically , directed downward.
a. What is the ratio of the electric force on the bee to the bee鈥檚 weight?
b. What electric field strength and direction would allow the bee to hang suspended in the air?
A circular disk has a surface charge density . What will the surface charge density be if the radius of the disk is doubled?
FIGURE shows a thin rod of length with total charge . Find an expression for the electric field at point . Give your answer in component form.
A ring of radius has total charge.
At what distance along the -axis is the electric field strength a maximum?
What is the electric field strength at this point?
An ammonia molecule has a permanent electric dipole moment. A proton is from the molecule in the plane that bisects the dipole. What is the electric force of the molecule on the proton?
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