The near point (the smallest distance at which an object can be seen clearly) and the far point (the largest distance at which an object can be seen clearly) are measured for six different people.

near point (cm) far point (cm)
Avishka 40 infinity
berenice 30 300
chadwick 25 500
danya 25 infinity
edouard 80 200
francesca 50 infinity

a. Which, if any of these people are nearsighted (myopic)?
b. Which, if any, of these people require bifocals to correct their vision?
c. Which, if any, of these people's vision can be corrected using only converging lenses?

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:

365.25 earth days are in the year of a light year