pfy p.300

2. a) The lines of the magnetic field round a straight current carrying conductor are in the shape of concentric circles
b) The right-hand grip rule: if you grip the iron core with your right hand pointing with the thumb, your fingers curl with the magnetic field lines
c) for a solenoid, the magnetic field is like that of a bar magnet
d) if a coil is viewed from one end and the current flows in an anti-clockwise direction, then this end is a north pole
e) The magnetic effect of a coil can be increased by increasing the number of turnes in the coil, increasing the current, or inserting an iron core

3. a) south
b) east