Suppose n electrons can be placed in either of two configurations. in configuration 1, they are all placed on the circumference of a narrow ring of radius rand are uniformly distributed so that the distance between adjacent electrons is the same everywhere. in configuration 2, n – 1 electrons are uniformly distributed on the ring and one electron is placed in the center of the ring. (a) what is the smallest value of n for which the second configuration is less energetic than the first? (b) for that value of n, consider any one circumference electron—call it e0. how many other circumference electrons are closer to e0than the central electron is?

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:

does anyone know or what?