Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnitude of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T • m/
A)
A) 1.0 × 10-5 T
B) 2.0 × 10-5 T
C) 3.0 × 10-5 T
D) 4.0 × 10-5 T
E) 5.0 × 10-5 T
E
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Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. Six months later the temperature has dropped to -2.°F
How much space now exists between each rail? [ linear expansion coef. for steel is 12. × 10-6 C°-1]
Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
a. 22 J b. 16 J c. 13 J d. 19 J e. 8.0 J
An anti-proton would have
A) negative charge and positive mass. B) no charge and positive mass. C) negative charge and negative mass. D) positive charge and negative mass. E) positive charge and positive mass.
How many revolutions per second are needed for a centrifuge to produce an acceleration of 1 200g at a radius arm of 15.0 cm?
a. 0.0280 rev/s b. 44.6 rev/s c. 14.2 rev/s d. 6.68 rev/s