If a quasar has a red shift of 0.98, then it is receding from Earth at 98 percent the speed of light
Indicate whether the statement is true or false
F
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Two long wires are parallel to each other. One wire carries a current directed due east and the other carries a current of the same magnitude, but directed due west. Which one of the following statements concerning this situation is false?
a) The magnetic field in the plane of the wires at the midpoint between the two wires is equal to zero tesla. b) The magnetic forces due to the currents carried by the wires causes the wires to move apart. c) If you are looking toward the west along the wire carrying the current toward the west, the magnetic field lines are directed clockwise around the wire d) The magnetic field produced by each wire has its greatest magnitude outside, but near the surface of the wire.
When a steady voltage is across one-half as much resistance, the current
A) is half. B) remains the same. C) is doubled. D) is quadrupled.
With respect to heavy elements, the stars of the Halo are ________ in metals
Fill in the blank(s) with correct word
A straight 1.0-m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T
If the wire experiences a force of 0.60 N, what is the current in the wire? A) 2.0 A B) 1.0 A C) 3.0 A D) 4.0 A E) 5.0 A