Write a Semi formal letter to the principal asking him her
to provide of what you are lacking in the school premises or the classrooms

Here's the plan

Explanation:

1- Think about the missing things that the school building needs, for example: lights or umbrellas, and so on

2- After writing the missing things, you will only need to arrange the ideas in an article organized as an introduction, such as: Hello Sir, I want to suggest you and so on. Then in the presentation write the details that I arranged and in the conclusion write, for example: I hope you agree with my suggestion and thank you or another closing method such as: In The conclusion

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: