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A square cardboard of side I and mass m is suspended from a horizontal axis XY as shown in figure. A single wire is wound along the periphery of board and carrying a clockwise current I. At t = 0, a vertical downward magnetic field of induction B is switched on. Find the minimum magnitude of B so that the board will be able to rotate up to horizontal level.

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`(mg)/(2il)`
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MOTION-MAGNETISM -EXERCISE-3 (Level-I)
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  2. A current I, indicated by the crosses in fig. is established in a stri...

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  5. A current I, indicated by the crosses in fig. is established in a stri...

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  6. A current I, indicated by the crosses in fig. is established in a stri...

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  14. An infinitely long straight wire carries a conventional current I as s...

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  15. A charged particle having mass m and charge q is accelerated by a pote...

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  16. A square cardboard of side I and mass m is suspended from a horizontal...

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  17. A wire loop carrying I is placed in the x-yplane as shown in fig. (...

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  18. A wire loop carrying current I is placed in the x-y plane as shown in ...

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  19. The length of a magnet is large compared to its width and breadth. The...

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  20. A certain amount of current when flowing in a properly set tangent gal...

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