At a point in São Paulo (a Brazilian city), the earth's magnetic field vector has magnitude \( B_{\small E}=8 \pi \times 10^{–6} \mathrm T \). At this point, a solenoid is placed so that its axis is parallel to the Earth's magnetic field \( {\vec B}_{\small E} \). The length of the solenoid is 0.25 m and it has 500 turns. Calculate the magnitude of its current so that the magnetic field inside it is zero. Vacuum Magnetic Permeability   \( \mu_0=4\pi \times 10^{-7}\;\mathrm{\frac{T.m}{A}} \).