Question

describe in brief the construction of a compass needle state its main use

Answer 1

It may help you

Actually the needle of the compass is magnetic so the north pole of it which is in white in colour attracts towards south and its south pole which is in red in colour is attracted towards north.

everthing is based on this ,that means opposite poles attract and similar poles repel.

Answer 2

the needle of a magnetic compass made of a metallic substance which can be magnetized for an extended period of time . it is mainly used for show directions