#3: Directions: Read the paragraph and answer the question. (1) Female astronauts, lawyers, and legislators are examples of the increasing number of women in leadership roles today. (2) Margaret Thatcher, Maya Angelou, Janet Reno, and Rita Moreno achieved great success in their fields. (3) In developing nations, women are particularly needed because much work must be done. (4) The contributions of women are essential in the process of finding solutions to the world’s problems. Select the correct answer. Which numbered sentence is the topic sentence? A. 1 B. 2 C. 3 D. 4

4

Explanation:

it is the topic sentence because it summarizes the main idea in the paragraph that is paragraph 4

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: