An airliner is flying due east from the USA to France. The Earth's magnetic field acts at $60^{\circ}$ to the horizontal and has a strength of $\sqrt{3} \times 10^{-4} T$, and the aircraft speed is $300 ms^{-1}$. The wing span of the aircraft is 60 m. The potential difference induced between the tips of the wings is:

2.7 V

The correct answer is Option (1) → 2.7 V