Which sentence contains an error in the use of end marks or commas? a. after his tour of duty ends he intends to work for science pathways corp. b. lt. walker will be coming on thursday to tell us how radar works. c. walker, an expert on radar, will be here for about 90 minutes. d. i met him last summer in pensacola, and we have kept in touch by writing letters.

i think you should write from the heart and think what truely makes a hero. i can’t do this for you. even though this is it’s up to you.

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:

i think the answer is either c or d

im thinking d might make more sense though

sorry if im wrong