What value of B should be used in a velocity selector to separate out 2.0-keV protons if E is fixed at 80 kV/m?
A. 0.18 T
B. 0.11 T
C. 0.15 T
D. 0.13 T
E. 0.23 T
Answer: D
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A conducting bar moves as shown near a long wire carrying a constant 50-A current. If a = 4.0 mm, L = 50 cm, and v = 12 m/s, what is the potential difference, VA?VB?
A. +15 mV B. ?15 mV C. +20 mV D. ?20 mV E. +10 mV
A cylindrical insulated wire of diameter 5.0 mm is tightly wound 200 times around a cylindrical core to form a solenoid with adjacent coils touching each other
When a 0.10 A current is sent through the wire, what is the magnitude of the magnetic field on the axis of the solenoid near its center? (?0 = 4? × 10-7 T • m/A) A) 6.6 × 10-5 T B) 2.5 × 10-5 T C) 1.3 × 10-5 T D) 3.6 × 10-5 T E) 9.8 × 10-5 T
It's harder to stop or turn a moving supertanker than a small speedboat because
A) the speed boat has a larger velocity. B) the supertanker has more force. C) the supertanker has a larger momentum. D) the supertanker has a larger velocity. E) the speedboat has more force.
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.