A jet plane is travelling west at a speed fo 720 km `h^- 1` . What is the voltage difference developed between the ends of the wing 20 m long if the earth's magnetic field is `5 xx 10 ^- 4T` and dip angle is `30^@` at the place?

The angle of dip at a place is 60^@ N. find the value of the total intensity of the earth's magnetic field. [Given H = 3.6 xx 10^-5 Tesla ]

An aeroplane having a wing span of 20 meter travels from Bhubaneswar to Bombay with a speed of 792 km/hr. the vertical component of the earth's magnetic field of induction of (4xx 10^-5) web//m^2 in the region over which the aeroplane is flying. Find out the emf induced across the wings of the aeroplane.