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Q. An aircraft having awing span of 10 m flies at a speed of 720 kmph. If the vertical component of the earth's magnetic field is 3 X 10^-5 T, calculate the emf induced between the ends of the wings.

Solution : e = - B l v

= - 3 × 10^-5 × 10 × 720 × 5 / 18

e = - 0.06 volt

Negative sign is due to Lenz law.

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