Force on a Moving Charge: A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component
A. downward.
B. upward.
C. towards the east.
D. towards the west.
E. towards the north.
Answer: C
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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
Two identical strings have the same length and same mass per unit length. String B is stretched with four times as great a tension as that applied to string A. Which statement is correct for all n harmonics on the two strings, n = 1, 2, 3...?
A.
B.
C.
D.
E.
Molecular Speeds: At what temperature would the root-mean-square speed of hydrogen, H2, molecules equal 11.2 km/s (the earth's escape speed)? The mass of a hydrogen atom is 1.67 × 10-27 kg, and the Boltzmann constant is 1.38 × 10-23 J/K.
A. 1.01 × 102 K B. 1.01 × 104 K C. 1.01 × 106 K D. 1.01 × 108 K
A supernova that occurs 10,000 years from now in a galaxy 50,000 light years away:
A) will be observed on Earth 10,000 years from now. B) was observed on Earth 40,000 years ago. C) will be observed on Earth 40,000 years from now. D) was observed on Earth 50,000 years ago. E) will be observed on Earth 50,0000 years from now.