(i) (a) What is a solenoid?
(b) Draw magnetic field around solenoid, showing clearly the magnetic polarities and the direction of magnetic lines of force.
(c) If the solenoid is suspended freely, in which direction is it likely to point?
(d) State three ways of increasing the magnetic strength of a solenoid.
(ii) (a) What do you understand by the term induced e.m.f.?
(b) The diagram given shows a loop of wire carrying current 1 .
(i) What is the magnetic polarity of the loop that faces us?
(ii) With respect to the diagram bow can we increase the strength of the magnetic field produced by this loop?

(iii) (a) What material is used for making the armature of an electric bell?
(b) Why does a magnetic needle show a deflection when brought close to a current carrying conductor?
(c) What type of current is transmitted from a power station?