In a superconductor, the electrical conductivity is infinite below the _________temperature.

Fill in the blank(s) with the appropriate word(s).


critical

Physics & Space Science

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A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars?

a. 1 solar masses b. 2 solar masses c. 4 solar masses d. 8 solar masses e. 16 solar masses

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Magnetic Field of a Current Loop: A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the figure. The current I in the wire flows to the right. In which direction must current flow in the loop to produce a net magnetic field of zero at its center?

A. counterclockwise B. clockwise C. It could be either clockwise or counterclockwise. D. The current in the loop should be zero.

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Two charged particles held a certain distance apart are released. As they move, the force on each particle increases. Therefore, their charges have

A) the same sign. B) opposite signs. C) the same mass. D) the same size. E) need more information

Physics & Space Science

The first spacecraft to return surface samples of an asteroid was named

A) Dawn. B) Stardust. C) Giotto. D) Hayabusa. E) NEAR.

Physics & Space Science