Basic Electricity 2, May/June 2015

Question 1

Figure 1 is a coil of wire wound on an iron core connected to a battery.

(a) Sketch the magnetic field pattern of the current-carrying coil indicating its polarity.

(b) State one rule for the determination of the polarity of the field in 1 (a).  


       The expected answers were;

(b) The polarity of the field is determined either by the screw rule or by the right hand grip rule

The candidates were expected to sketch the magnetic field pattern of a current carrying coil wound on an iron core, indicating its polarity and to state the rule for determining its polarity.

The performance of the candidates was reported very good in question 1.