An aero plane is flying horizontally from west to east with a velocity of 900km/hour. Calculate the potential difference developed between the ends of its windshaving a space of 20 m. The horizontal component of the Earth’s magnetic field is 𝟓 ×𝟏𝟎−𝟒𝐓 and the angle of dip is 𝟑𝟎𝟎.

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AB is a current carrying conductor in the plane of the paper as shown in the figure below. (i) What is the direction of the magnetic field produced by it at point ‘X’? Write the statement of the rule used to find the direction of field lines. (ii) If the polarity of the battery connected to the wire is reversed, how would the direction of the magnetic field be changed? (iii) Point ‘X’ is at a distance r1 and point ‘Y’ is at a distance r2 (r1

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For minimum flux the angle between the magnetic field and normal to the surface is