In the figure, CDEF is a fixed conducting smooth frame in vertical plane. A conducting uniform rod GH of mass ‘m’ can move vertically and smoothly without losing contact with the frame. GH always remains horizontal. It is given velocity ‘u’ upwards and released. Taking the acceleration due to gravity as ‘g’ and assuming that no resistance is present other than ‘R’. Find out time taken by rod to reach the highest point

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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