Practice Problems Electric fields

Directions: On this worksheet you will investigate properties of electric fields.

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Question 1  Which set of equations correctly describes the electric fields in this diagram? The central +4 point charge has no dimension.

 r < r1 r1 < r < r2 r > r2 A E = 0 E = k(12q)/r2 E = k(8q)/r2 B E = k(4q)/r2 E = 0 E = k(12q)/r2 C E = k(4q)/r2 E = k(8q)/r2 E = 0 D E = k(4q)/r2 E = 0 E = k(8q)/r2
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Question 2

If a charge of +29 µC is placed in an uniform electric field having a strength of 7000 N/C, it will experience a force of
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Question 3  If the central charge is +5 µC, and point B is 29 cm away, what is the magnitude of the electric field strength at point B?

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Question 4  According to the diagram shown below, what is the ratio of the magnitude of the left charge compared to the magnitude of the right charge?

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Question 5  What magnitude electric field is required in a cathode ray tube to accelerate electrons from 0 to 1.7 x 107 m/sec in a distance of 2.9 cm?
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Question 6  In Question 5, through how large a potential difference does the electron travel while accelerating?
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Question 7  In Millikan’s oil drop experiment, if the electric field between the plates was adjusted to the right magnitude, it would exactly balance the weight of the drop. Suppose a tiny spherical oil droplet of radius 1.7 x 10-6 meters carries a charge equivalent to two electrons. What electric field is required to balance the weight? (The density of oil is 850 kg/m3.)

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