Due to the connection between electric and magnetic phenomena, the magnetic field generated by an MRI machine can be used to excite the positive charges in hydrogen atoms. These hydrogen atoms emit radio waves that can be used to form an image of their locations. The main source of hydrogen atoms in the human body is water. Which of the following are limitations this method might place on the images that can be generated? Select all that apply.

A
Detecting hydrogen atoms allows for certain parts of the body to be imaged better than others.
B
Areas without large amounts of water are harder to map.

C
Hydrogen is not present in the human body.

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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: