Mark's physics book is on the desk. Mark pushes horizontally (from the side) on the book, but the book does not move. Diagram A shows a box with a downward and upward arrow equal in size Diagram B shows a box with an arrow up, down, left, and right all equal in size. Diagram C shows a box with shortest arrow pointing left, equal arrows pointing up and down, and longest arrow pointing right. Diagram D shows a box with a downward and upward arrow with the downward arrow larger in size. Which force diagram represents the force on the physics book? You may neglect air resistance.

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: