Which item, when wrapped with a current-carrying coil, produces the greatest magnetic field inside the coil?

a. wooden rod
b. glass rod
c. iron rod
d. rubber rod

C!!! The iron rod! Hope this Helps!!!

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The correct answer is "iron rod".

Explanation:

Electromagnet is not a permanent magnet. The electromagnet consists of wrapping the coils around the iron rod.

When the current passes through it it will retain its magnetic property. Iron retains the magnetic property as the current flows in the electromagnet. Iron is a ferromagnetic material.

It will loose its magnetism easily when the power is switched off.

The strength of the magnetism depends on the number of turns and the amount of current flowing through it.

Therefore, the correct option is (C).

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.