The device used for producing current is called a,
(i) Generator
(ii) Voltmeter
(iii) Ammeter
(iv) Galvanometer.

31 Explain the principle, construction and working of a DC Motor. 32 What is a fuse wire? What is the advantage and disadvantage of using a thick fuse wire? 34 What are magnetic field lines? How is the direction of a magnetic field at a point determined? Mention two important properties of the magnetic field lines. 35 Draw a rough sketch of the pattern of field lines due to a
(i) current flowing into a circular coil and
(ii) solenoid carrying current.