At a certain location, Earth's magnetic field of 44 µT is horizontal and directed due north. Suppose the net field is zero exactly 11 cm above a long, straight, horizontal wire that carries a constant current. What is (a) the magnitude of the current (in A) and (b) the angle between the current direction and due north?

a) The magnitude of the current is 24.19 A

b) The angle is 90°

Explanation:

a) Given:

B = magnetic field = 44 µT = 44x10⁻⁶T

r = distance = 11 cm = 0.11 m

The current is:

b) Because the current flows from the west to the east, therefore, the angle is 90 degrees from the north.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.