A bar magnet is held stationary while a circular loop of wire is moved toward the magnet at constant velocity at position A as in the figure
The loop passes over the magnet’s center at position B and moves away from the magnet at position C. Viewing the loop from the left as indicated in the figure, for which position is the induced current zero?
a.
Position A
b.
Position B
c.
Position C
d.
The induced current is never zero.
b
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The following statements all refer to the human brain when mental activity is occurring. Which statement is correct?
a. In order to detect electric currents in the brain, you must open the skull and make direct electrical contact with the brain. b. The electric currents in the brain can be detected outside the brain by detecting the magnetic fields they produce. c. The electric currents in the brain can be mapped by shaving a person's head and dropping iron filings on the head. d. The electric currents in the brain produce an aura that can be detected visually. e. The electric currents in the brain cannot be detected by any means.
Latent Heats: A 2294-kg sample of water at 0° C is cooled to -36°C, and freezes in the process. How much heat is liberated? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg. The specific heat of ice is 2050 J/kg ? K.
A. 935,000 kJ B. 597,000 kJ C. 1,110,000 kJ D. 334,000 kJ
A proton and electron, each travelling with the same velocity in the +x direction enter separate regions of uniform magnetic field in the +y direction (Bp for the proton, Be for the electron). They each experience the same acceleration. Hence we know
A. The magnetic fields were in the opposite direction and have ratio Bp/Be= mp/me B. The magnetic fields were in the opposite direction and have ratio Bp/Be= me/mp C. The magnetic fields were identical in magnitude and direction D. The magnetic fields were in the same direction and have ratio Bp/Be= me/mp E. The magnetic fields were in the same direction and have ratio Bp/Be= mp/me F. The magnetic fields were identical in magnitude and opposite in direction
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s