What current is needed in the solenoid's wires? express your answer to two significant figures and include the appropriate units. problem 24.16a researcher 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 3.6m , with a total of 5000 turns of wire. the solenoid is oriented to produce a field that opposes and exactly cancels the 52 ? t local value of the earth's field

I = 2.98 10⁻² A

Explanation:

The equation for the magnetic field within a solenoid is

        B = μ₀ n I

Where miuo is the magnetized permittivity that is worth 4π 10⁻⁷ N / A², n is the density is turns per unit length and I is the current

Density is defined as the number of turns per unit length

       n = N / L

We replace

      B =  μ₀  N/L  I

      I = B L /  μ₀  N

We calculate

     I = 52 10⁻⁶ 3.6 / (4π 10⁻⁷ 5000)

     I = 2.98 10⁻² A

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

0.55x745.7j and a calculator