An RL circuit has L = 0.40 H and R = 5.0 W. It is connected to a battery with e = 22 V at time t = 0 . Find the energy stored in the inductor when the current in the circuit is 2.3 A
a. 5.0 J
c. 50 mJ
b. 2.0 J
d. 1.1 J
D
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Two large parallel conducting plates are 8.0 cm apart and carry equal but opposite charges on their facing surfaces. The magnitude of the surface charge density on either of the facing surfaces is 2.0 nC/m2 . Determine the magnitude of the electric potential difference between the plates
a. 36 V b. 27 V c. 18 V d. 45 V e. 16 V
Where do most dust grains form?
A) in molecular clouds B) in the winds of red giant stars C) in planetary nebulae D) in supernovae E) all of the above
To burn a hole in a piece of paper using light from the Sun, which mirror would work the best?
A) Plane B) Convex C) Concave D) All of the given answers would work equally as well. E) None of the given answers would burn a hole.
An object is placed 40 cm in front of a lens of focal length 40 cm. A second lens is placed 17 cm beyond the first. An image forms 48 cm past the second lens. The lateral magnification of this system is
A) -2.8. B) -1.2. C) 1.2. D) 2.8. E) impossible to determine with the information given.