Second closest star to Earth

At a point in space where the magnetic field is measured, the magnetic field produced by a current element

a. points radially away in the direction from the current element to the point in space. b. points radially in the direction from the point in space towards the current element. c. points in a direction parallel to the current element. d. points in a direction parallel to but opposite in direction to the current element. e. points in a direction that is perpendicular to the current element and perpendicular to the radial direction.

How do we account for the great variety of substances in the world?

A) The Earth is 4.5 billion years old.
B) Most of these substances are organic compounds.
C) Atoms are incredibly small.
D) There are many possible combinations of atoms.

A strong temperature gradient contributes to steep pressure gradients and this can create very strong

A) latitudes. B) winds. C) doldrums. D) frictional force.

Magnetic Field of a Long Wire: Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires

A. points upward. B. points downward. C. points toward you. D. points away from you. E. is zero.