A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is:

 B = 4.52 10⁻² T

Explanation:

A solenoid creates a magnetic field given by

         B = μ₀ n i

Let's look for the density of turns in the solenoid length

         n = N / l

         n = 1000 / 0.50

        n = 2000 turns / m

        B = 4π 10⁻⁷ 2000 18

        B = 4.52 10⁻² T

The magnetic field is uniform inside the solenoid

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is