Which type of force can act through empty space?

spring

tension

normal

magnetism

Answer

Magnetism

By empty space we mean in vacuum. A force in a spring means gravity must play part. Force on a spring gravitational force must apply. For this reason it can not act through empty space.

Tension is the force experienced due to compression or extension. In this case gravity is involved and so it can't act through empty space.

Normal force is given by the product of mass and gravity.

Magnetism is the force of attraction or repulsion in magnetism. This is the only force that can act through empty space.  

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:

true tan speed = ang vel x radius