Two circular coils of diameter 30.0 cm are parallel to each other and have their centers along the same line L but separated by 22.0 cm. When an experimenter views the coils along L, the coil closer to her carries a clockwise current of 2.50 A
Find the magnitude and sense (clockwise or counterclockwise) of the current needed in the other coil so that the net magnetic field on L midway between the two coils will have a magnitude of 4.10 µT and point away from the experimenter who is viewing the coils along L. (?0 = 4? × 10-7 T ? m/A)
0.633 A, counterclockwise
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a. Herbig-Haro object b. globular cluster c. open cluster d. giant cluster e. supernova
If the radiation curve for an incandescent lamp filament peaks in the green region, the object would appear
A) red. B) yellow. C) green. D) blue. E) white.
A 1.0-kg block and a 2.0-kg block are pressed together on a horizontal frictionless surface with a compressed very light spring between them. They are not attached to the spring. After they are released and have both moved free of the spring
A) the magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block. B) the heavier block will have more kinetic energy than the lighter block. C) both blocks will both have the same amount of kinetic energy. D) the lighter block will have more kinetic energy than the heavier block. E) both blocks will have equal speeds.
If you are in the Moon's umbral shadow, then you will witness:
A) nighttime. B) a total solar eclipse. C) a total lunar eclipse. D) a partial solar eclipse. E) some kind of lunar eclipse.