### Magnetostatics Objectives part 02

21 . The unit of retentivity is Weber/sq.m

22 . The unit of retentivity is Ampre turn/weber

23 . The left-hand rule correlates Current, magnetic field and direction of the force on a conductor.

24 . In the left hand rule the thumb always represents Direction of force on conductor

25 . A point pole has a strength of 4π x 10-4 weber. The force in newtons on a point pole of 4πx1.5 x10-4 weber placed at a distance of 10cm from it will be 15N.

26 . If current changing at the rate of 1amp/sec in one coil, induces a emf of 1V in the other, then the two coils are said to have a mutual inductance of 1 Henery

27 . DIAGRAM QUESTION—

28 . The force between two long parallel conductors is inversely proportional to distance between the conductors.

29 . DIAGRAM QUESTION—

30 . The co-efficient of coupling between two air core coils depends on Mutual inductance and self-inductance of the two coils

31 . DIAGRAM QUESTION—

32 . While comparing magnetic and electric circuits the flux of magnetic circuit is compared with which parameters of electrical circuit Current.

33 . While comparing magnetic and electric circuits, the point of dissimilarity exists while considering flux and current flow.

34 . DIAGRAM QUESTION—

35 . For a coil the co-efficient of self-inductance is given NФ/I

36 . In a B-H curve B is along Y-axis and H is along X-axis.

37 . For a B-H curve if area under the curve is A sq.cm and for H, 1cm =xAT/m, and for B 1cm= y Wb/m3, then work done in joules per m3 per cycle is given by Xxy

38 . DIAGRAM QUESTION—

39 . DIAGRAM QUESTION—

40 . DIAGRAM QUESTION–