Read the excerpt from Liam’s blog.

If it’s spring cleaning time at your house, please consider giving me a call! My friends and I started washing windows three years ago. We supply all of our own equipment and leave your house sparkling clean. Our service is guaranteed!

The purpose of Liam’s blog is to

advertise his window washing service.
entertain with stories about his job.
persuade readers to use his cleaning products.
teach readers about window cleaning safety.

He is advertising his window washing service.

she is outspoken and direct

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: