You sit in the center of a room that includes an amazing surround-sound system, consisting of 10 speakers (all of which are equidistant from your ears). You play a tone from all 10 speakers at once, but they have randomly-distributed relative phases, so you hear the same volume as if you turned up the power coming through a single speaker by a factor of 10. From this arrangement you hear the tone at an intensity level of . Next you reconfigure the speakers so that they play the tones in phase. If the volume of each speaker is the same as before, what is the decibel level of this new sound

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: