When a metal bar is heated the increase in length is greater if 1 the bar is long.
2 the temperature rise is large.
3 the bar has a large diameter.
Which statement(s) is (are) correct?
A 1, 2, 3.
B 1, 2.
C 2, 3.
D 1.
E 3.
Plz help me ASAP!! ( ◜‿◝ )♡

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:

i don't know that i agree with that but what's the question ?

where’s the list ? the question is incomplete

i think the answer would be reserve.