X CLASS MAGNETISM

Class X Marks: 25
Subject: Physics Time: 45 minutes

MAGNETISM


I. Answer the Following: 5X3=15

1.Compare dia, para, and Ferro magnetic substances.
2.Write the postulates of Ewing’s molecular theory of magnetism.
3.Draw magnetic lines of force when N pole of a bar magnet pointing geographical north

II. Answer the Following: 5X2= 10

4.Explain why ferromagnetic substance like iron is not a magnet by itself on the basis of domain theory?
5.Define magnetic moment? Write its units.
6.State inverse square law of magnetism.
7.Define (a) permeability (b) Retentivity.
8.Define magnetic flux density? Write its unit?

III. Fill In The Blanks:

1. 1 Tesla= __________ gauss..
2. B = ___________ H.
3. 1 weber = _________ A-m
4. Value of BO for A.P. is _______.
5. The units of χ is ________.