JEE Main 2016 Physics question
A fighter plane of length 20 m, wing span (distance from tip of one wing to the tip of the other wing) of 15 m and height 5 m is flying towards east over Delhi. Its speed is . The earth's magnetic field over Delhi is with the declination angle and dip of such that . If the voltage developed is between the lower and upper side of the plane and between the tips of the wings then and are close to :
Answer: (4)
Solution
Resolve the earth's field: the vertical component is T, and the horizontal (northward, since the declination is zero) component is T. With the velocity eastward, $
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