Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a wall, the wall doesn't slam into you at 30 km/s because the wall
A) has too little gravity to influence you.
B) moves in the opposite direction to you.
C) and you move at the same horizontal speed, before, during, and after your jump.
D) has negligible inertia compared with the Sun.
Answer: C
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a. True b. False Indicate whether the statement is true or false
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Two current loops are coaxial and coplanar. One has radius a and the other has radius 2a. Current 2I in the outer loop is parallel to current I in the inner loop. The magnitude of the magnetic field at the center of the two loops is
A.
B.
.C.
.D.
.E.
.