Aresearcher would like to perform an experiment in a zero magnetic field, which means that the field of the earth must be canceled. suppose the experiment is done inside a solenoid of diameter 1.0 m, length 3.0 m , with a total of 5000 turns of wire. the solenoid is oriented to produce a field that opposes and exactly cancels the 52 μt local value of the earth's field. what current is needed in the solenoid's wires?

  I = 2.48 10⁻² A

Explanation:

The magnetic field produced by a solenoid disproportionate to the density of turns and the current passing through the wire

        B = μ₀ n I

Where  μ₀ is the magnetic permeability that you are worth 4π 10⁻⁷ N/A²

Let's calculate the density of turns.

        n = N / L

        n = 5000 / 3.0

        n = 1666.67

Let's reduce the field to SI units

      B = 52 μT = 52 10⁻⁶ T

Let's calculate the current

      I = B /  μ₀ n

      I = 52 10⁻⁶ / (4π 10⁻⁷ 1666.67)

      I = 2.48 10⁻² A

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up