A flat circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of 30°
A) 0 T ? m2
B) 3.1 × 10-3 T ? m2
C) 5.5 × 10-3 T ? m2
D) 6.3 × 10-3 T ? m2
B
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____ is the point in Earth's orbit where Earth is closest to the Sun
a. Aphelion b. Perihelion c. Precession d. The winter solstice e. a and d
Consider a velocity with components 36. m/s Westward and 22. m/s Northward. What is its magnitude and direction?
What will be an ideal response?
An electron moves horizontally across the Earth’s equator at a speed of 2.50 × 106 m/s and in a direction 35.08 N of E. At this point, the Earth’s magnetic field has a direction due north, is parallel to the surface, and has a value of 3.00 × 1025 T. What is the force acting on the electron due to its interaction with the Earth’s magnetic field?
1.6.88 × 10-18 N due west 2.6.88 × 10-18 N toward the Earth’s surface 3.9.83 × 10-18 N toward the Earth’s surface 4.9.83 × 10-18 N away from the Earth’s surface 5.4.00 × 10-18 N away from the Earth’s surface
Frank says that if you release the string when swinging a ball in a horizontal circle, the ball flies out in the radial direction defined by the string at the instant you release the ball. John says that it flies out along a tangent line perpendicular to the string, and that it then drops straight down to the ground. Which one, if either, is correct?
a. Frank, because the centrifugal force is no longer counteracted by the string. b. Frank, because balls naturally fly straight out. c. John, because there is no centrifugal force. d. John, because balls fall straight down when released. e. Neither, because although there is no centrifugal force, and the ball's velocity is tangent to the circle at the instant of release, the ball then follows a parabolic trajectory.