### Magnetostatics Objectives part 02

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

**22 . ** The unit of retentivity is **Ampre turn/webe**r

**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–