A DC current of size 10 A flows through one coil of a transformer. What is the current flowing through the other coil of the transformer if that second coil has ten times as many loops as the first?
a. 0 A
b. 1.0 A
c. 10 A
d. 100 A
e. 1000 A
A
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The twinkling of starlight and the focusing of images by lenses are due to ________ of light
Fill in the blank(s) with correct word
The energy density of an electromagnetic wave in free space is
A) entirely in the electric field. B) entirely in the magnetic field. C) 1/4 in the electric field and 3/4 in the magnetic field. D) 1/4 in the magnetic field and 3/4 in the electric field. E) equally divided between the magnetic and the electric fields.
A ball is thrown straight up. Neglecting air resistance, which statement is not true regarding the energy of the ball?
(a) The potential energy decreases while the ball is going up. (b) The kinetic energy decreases while the ball is going up. (c) The sum of the kinetic energy and potential energy is constant. (d) The potential energy decreases when the ball is coming down. (e) The kinetic energy increases when the ball is coming down.
An object is 50 cm from a concave mirror with radius of curvature of magnitude 60 cm. What is the lateral magnification produced by the mirror?
A) +0.40 B) +0.70 C) +1.5 D) -0.70 E) -1.5