PART TWO: STRUCTURE QUESTION 1. a) The lines of round a straight current-carrying conductor are in the shape of
b) The Right-hand Grip Rule: if you grip the with your right
pointing with the
field lines. For a solenoid, the magnetic field is like that of a
your fingers curl with the
If a coil is viewed from one end and the current flows in an anticlockwise direction, then this
pole.
The magnetic effect of a coil can be increased by increasing the number of increasing the
inserting an Core
2. Draw a magnetic field pattern around a circular coil
3. Draw magnetic field patterns around a straight current-carrying conductor
4. State and explain the effect on an electromagnet of
(a) Removing the core.
(b) Replacing the iron core with a steel core
5. (a) Draw a labelled diagram of a simple D. C. electric motor.
(b) State and explain three ways in which the forces on the coil, and hence the speed of
can be increased
6.A small electromagnet, used for lifting and then releasing a small
steel ball, is made in the laboratory as shown in the figure below​