Magnetic field at the focus of an ellipse!

An elliptical wire with semi major axis of length \(8 \text{m}\) and semi minor axis of length \(1 \text{m}\) contains a current of \(10^{7}A\).If the magnetic field at one of it's focus is of the form \(k\pi\text{ Tesla}\).

Find \(k^{2}\).

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