What groups have similar roles: Coaches and officials Fans and parents Players and officials o Fans and coaches​

Fans and Parents

Explanation:

Fans and Parents have similar roles because they are both saddled with the responsibility of encouraging /cheering their team and wards respectively.

Both of them are also involved in the defense of their teams/ wards best interests, however, the methods involved in the processes are usually quite different.

These points makes it the best and most suitable answer in the list of options.

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: