A 2.0-C charge moves with a velocity of (
) m/s and experiences a magnetic force of (
) N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field.
A. ?3.0 T
B. +3.0 T
C. +5.0 T
D. ?5.0 T
E. +6.0 T
Answer: B
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The symbols 
and 
are used to represent, respectively, the charge density per unit
A. length, volume, and area. B. volume, length, and area. C. area, volume, and length. D. volume, area, and length. E. area, length, and volume.
The impedance of the parallel RLC circuit shown is given by
A.
B.
C.
D.
E.
At what frequency should a 200-turn, flat coil of cross sectional area of 300 cm2 be rotated in a uniform 30-mT magnetic field to have a maximum value of the induced emf equal to 8.0 V?
a. 7.5 Hz b. 7.1 Hz c. 8.0 Hz d. 8.4 Hz e. 16 Hz
Photon Energy: Two sources emit beams of microwaves. The microwaves from source A have a frequency of 10 GHz, and the ones from source B have a frequency of 20 GHz. This is all we know about the two beams. Which of the following statements about these beams are correct? (There could be more than one correct choice.)
A. Beam B carries twice as many photons per second as beam A. B. A photon in beam B has twice the energy of a photon in beam A. C. The intensity of beam B is twice as great as the intensity of beam A. D. A photon in beam B has the same energy as a photon in beam A. E. None of these statements are true.