Step 1:
The magnetic field along the axis of a solenoid is given by the formula:
$$B = \frac{\mu_0 n I}{2} (\cos\theta_1 - \cos\theta_2)$$
where $\mu_0 = 4\pi \times 10^{-7} T m/A$ is the permeability of free space, $n$ is the number of turns per unit length, $I$
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