A cylinder and its dimensions are shown below.
12.1 cm
3.8 cm
One equation for calculating the volume of a cylinder is v=8h, where 8 represents the area
of the base of the cylinder. Which expression can be used to find the value of 8, in square
cenumeters, for this cylinder?
A (12.17
B 28(12.1)
C +(3.8)
None of these

the answer is b

explanation:

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:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this