A flat coil having 40 turns, each one of cross-sectional area 12.0 cm^2, is oriented with its plane perpendicular to a uniform magnetic field. The field varies steadily from 0.00 T to 1.20 T in 20.0 ms. What emf is induced in the coil during this time?

The induced emf in the coil is 2.88 V

Explanation:

Given;

number of turns of the coil, N = 40

cross sectional area of the coil, A = 12.0 cm² = 12 x 10 ⁻⁴ m²

the magnetic field strength, B = 1.2 T

change in time, dt = 20 ms = 20 x 10⁻³ s

The emf induced in the coil is calculated as;

Therefore, the induced emf in the coil is 2.88 V

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.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it