The electric field at the surface of a positively charged conductor has a direction characterized by which of the following?

a. tangent to the surface
b. perpendicular inward toward the charge
c. at a 45° angle to the surface
d. perpendicular outward and away from the charge


d

Physics & Space Science

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What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?

A) 2.0 cm B) 3.0 cm C) 4.0 cm D) 5.0 cm E) 6.0 cm

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The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III

?
The object’s acceleration is zero only in region II.

a.
True

b.
False

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Polarizing sunglasses have the transmission axis oriented ______________

Fill in the blank(s) with correct word

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Free Fall: A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming negligible air resistance?

A. 20 m B. 30 m C. 50 m D. 70 m

Physics & Space Science