Q 12-06-014NEETJEE MainEasy
An aeroplane with a wingspan of $40$ m flies horizontally at $250$ m/s at a place where the vertical component of the Earth's magnetic field is $5 \times 10^{-5}$ T. The emf induced between its wing tips is
Answer: (D) $0.5$ V
Concept. Horizontal wings moving horizontally cut the vertical field component: $\varepsilon = B_Vvl$.
Step 1. Substitute.
$$\varepsilon = 5 \times 10^{-5} \times 250 \times 40 = 0.5\ \text{V}$$
Answer. $0.5$ V (Option D).
Solution by Sreeraj P, M.Sc Physics