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A current loop of magnetic moment 0.02 A m^(2) or (J T^(-1) ) si suspended freely in a magnetic field . In which position will it come to rest in the magnetic field? From this position of rest if it is turned through 60^(@) , what is the work done? (B=0.2 T)

An electron with a speed of 2.60 xx 10^(8) cm//s enters and electric field of magnitude 1.00 xx 10^(3)N//C , travelling along a field in the direction that retards its motion. (a) How far will the electron travel in the field before stopping momentarily, and (b) how much time will have elapsed ? (c ) If the region containing the electric field is 8.00 mm long (too short for the electroc to stop within it),what fraction of the electrons initial energy will be lost in that region ?

The field lines for two point charges shown in fig. (i) Is the field uniform? (ii) Determine the ratio q_(A)//q_(B) . (iii) What are the sign of q_(A) and q_(B) ? (iv) Apart from infinity, where is the neutral point? (v) If q_(A) and q_(B) are separated by a distance 10(sqrt(2)-1) cm, find the position of neutral point. (vi) where will the lines meet which are coming from A and are not meeting at q_(B) ? (vii) Will a positive charge follow the line of force if free to move?