The primary of a transformer is the coil connected to
A) the load.
B) the Internet.
C) the input power line.
D) none of the above
Answer: C
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An important reason for using a very large diameter objective in an astronomical telescope is
A) to increase the magnification. B) to increase the resolution. C) to form a virtual image, which is easier to look at. D) to increase the width of the field of view. E) to increase the depth of the field of view.
Charges q and Q are placed on the x axis at x = 0 and x = 2.0 m, respectively. If q = ?40 pC and Q = +30 pC, determine the net flux through a spherical surface (radius = 1.0 m) centered on the origin
a. ?9.6 N / m2/C b. ?6.8 N / m2/C c. ?8.5 N / m2/C d. ?4.5 N / m2/C e. ?1.1 N / m2/C
An iron rod becomes magnetic when
A) opposite ions accumulate at each end. B) its atoms are aligned. C) the net spins of many internal electrons are aligned. D) its electrons stop moving and point in the same direction.
An electron is bound in an infinite well (a box) of width 0.10 nm. If the electron is initially in the n = 8 state and falls to the n = 7 state, find the wavelength of the emitted photon
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) What will be an ideal response?