What could have gone wrong during the exam? a He developed a brief outline of his essay before beginning to write.
b For the essay, he provided all the information he knew on the topic, resulting in a lengthy two-page answer.
c He answered the easy questions first.
d He took time at the beginning of class to survey the entire exam.

B: For the essay, he provided all the information he knew on the topic, resulting in a lengthy-two page answer.

Explanation:

All the other options besides B are good strategies that you should use for exams. Doing what's done in B is going to make you run out of time for the rest of your exam, and will result in a lot of useless information that isn't related to the question.

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: