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In gravity free space a uniform horizontal magnetic field exists into the plane of paper only in the region above xy A uniform vertical downward electric field of magnitude E a exists only in the region below xy as shown in figure The bob of simple pendulum of length L with point of suspension on line xy and having mass Im and charge q is given horizontal velocity at the lowest point such that the tension in string at this point is T 5qa Fixed L A q y 3 Af yg a fau yracu xy a had huu da B E a TRHU Ych 4x4 KETERA e faya a fa terfy 341 BO e m tu xy uz Anta far and Latis ura 4 ga nach c qaz Add fa g u42 34 ug z faj f Ga mich 34 far 42 zzf ada 5 qa FRETE L y E a q BO y E a The magnitude of magnetic field B such that as the bob enters the magnetic fiel the string becomes slack and then it passes through the point of projection is Bu yrachu a ude hem zem am ad a Me uz u tuu far qurd Correct Answer 2ma qL 2ma qL The magnitude of magnetic field B such that as the bob enters the magnetic fiel the string becomes slack and then it passes through the point of suspension is 8ma qL Buku 7 A mac yracu a f ude hem zz am ad ar Me ug Adtaa far quedi 2 Correct Answer 8ma qL The maximum magnitude of magnetic field such that the bob of the pendulum still completes the vertical circle is 4am qL i f c Ru fch t sa

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