Which sentence uses commas correctly? A. In the fielf behind my Grandpa's house was an old, stone wall

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

why were the wolves chased out of yellowstone nation park?

another character. imagine that section narrated in first person point of view from one of the character's perspective, and rewrite it in the space below, attempting to use a similar writing style as the original author. then, in a second paragraph, consider this: are you able to explore some of the same ideas and themes when viewing the situation from the character's first person point of view, as compared to when it is narrated from london's third-person limited