Three point charges are located on the x-axis. The first charge, 
is at x = -1.00 m; the second charge,
is at the origin; and the third charge, 
is located at x = 2.00 m. Which charge is subjected to the force of greatest magnitude?
A. 
B. 
C. 
D. 
E. 
B.
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In a liquid, a current is set up between points A and B. Positive ions are going from A to B moving 6.0 coulombs of positive charge per second and negative charges are moving from B to A moving 2.0 coulombs of negative charge per second. What is the current from A to B?
A. 8.0 A B. -8.0 A C. 4.0 A D. -4.0 A E. 12 A
Active galaxies are thought to have _______ in their centers
a. accretion disks b. massive black holes c. accretion disks and massive black holes d. the Local Group e. a cluster of galaxies
A small airplane with a wing span of 12 m flies horizontally and due north at a speed of 60 m/s in a region where the magnetic field of the earth is 60 ?T directed 60° below the horizontal. What is the magnitude of the induced emf between the ends of the wing?
A. 50 mV B. 31 mV C. 37 mV D. 44 mV E. 22 mV
A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field.
A. either 39° or 141° B. either 25° or 155° C. either 70° or 110° D. either 42° or 138° E. either 65° or 115°