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.

33 The device used for producing current is called a,
(i) Generator
(ii) Voltmeter
(iii) Ammeter
(iv) Galvanometer. 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. 36  State the rule to determine the direction of a
(i) magnetic field produced around a straight conductor-carrying current,
(ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and
(iii) current induced in a coil due to its rotation in a magnetic field.
(iii) Current induced in a circuit by the changing magnetic flux due to the motion of a magnet.  37 On what factors does the force experienced by a current–carrying conductor placed in a uniform magnetic field depend?