When static equilibrium is established for a charged conductor, the electric field just inside the surface of the conductor is
A)
opposite to the field outside.
B)
equal to the perpendicular component of the field outside.
C)
equal to the field outside.
D)
zero.
E)
cannot be determined.
D
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Force on a Wire: A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure. If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section CD of this coil?
A. perpendicular to and into the page B. perpendicular to and out of the page C. in the direction of the magnetic field D. in the opposite direction of the magnetic field E. The force is zero.
People somewhere on Earth experience a sequence of two or three eclipses of various sorts in January and February. When will people next have an opportunity to see eclipses?
What will be an ideal response?
An airplane with an airspeed of 120. km/h is headed 30.0° East of North in a wind blowing due West at 30. km/h. What is the groundspeed of the plane?
What will be an ideal response?
A ball rolls off a shelf and hits the floor below 0.25 second later. To find the speed of the ball as it left the shelf, we would need
A. to repeat the experiment. B. the distance measured along the floor to the point of impact. C. the weight of the ball. D. the height of the table.