A loop lying in the xy plane conducts a conventional current in the direction shown. What is the direction of the magnetic field at each of points a through f?





A. +x direction

B. -x direction

C. +y direction

D. -y direction

E. +z direction

F. -z direction

T. The field is zero.


E. +z direction

Physics & Space Science

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Why was the discovery of Mercury's liquid core a surprise to scientists?

A. Mercury's rotation was too slow to sustain a liquid core. B. Mercury's small size should have allowed it to cool early in its history. C. Mercury's density suggested that there should have been a small solid core. D. Mercury's magnetic field was too weak to be generated by a liquid core.

Physics & Space Science

The change in the frequency of a wave due to the motion of the source (or observer) is known as

A) the Bell effect. B) the Mach effect. C) the Doppler effect. D) interference. E) diffraction.

Physics & Space Science

The rigid body shown is rotated about an axis perpendicular to the paper and through the point P. If M = 0.40 kg, a = 30 cm, and b = 50 cm, how much work is required to take the body from rest to an angular speed of 5.0 rad/s? Neglect the mass of the connecting rods and treat the masses as particles



a.
2.9 J

b.
2.6 J

c.
3.1 J

d.
3.4 J

e.
1.6 J

Physics & Space Science

Although antimatter is an interesting theoretical idea, there is no evidence that it actually exists

Indicate whether the statement is true or false

Physics & Space Science