Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field

perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?









a.

The loop moved from bottom to top.



b.

The loop moved from top to bottom.



c.

The loop moved from left to right.



d.

The loop moved from right to left.



e.

All of these directions of motion will produce the graph of emf vs t.

---

e

Physics & Space Science

Which of the following is a form of matter and not a form of radiation?

A) gamma rays B) the electron beam that creates the picture on a TV tube C) X-rays D) None of the above are forms of radiation. E) All of the above are forms of radiation.

A thin spherical shell of radius 20.0 cm has 5.0 ?C of charge uniformly distributed over its surface. What is the magnitude of the electric field 2.00 m from the center of the sphere?

a.
b.
c.
d.
e. 0

Where in the "Tree of Life" will current organisms be located that are most closely related to the common ancestor of all life on Earth?

A) at the branch between animals and plants B) very close to the root C) at the branch between Archaea and Eukarya D) very far from the root

This figure shows observations that have allowed astronomers to determine the orbits of several stars around Sgr A* (the central object). What can we learn about Sgr A* by analyzing these orbits?

A) its mass B) its age C) its chemical composition D) all of the above